[2026 Latest] Top 3 Ranking of Paranormal Rumors Related to Waterfronts (Waterfalls, Lakes, Dams, and the Sea) in the Tokai Region

From ghost stories related to waterfronts in the Tokai region, we selected the sacred pond at Osezaki, Maruyama Dam, and Akame Forty-Eight Waterfalls, comparing external rumors with publicly available documents from administrators and local governments for each claim. What do verifiable facts—such as the seaside freshwater pond, the history of dam construction, and the waterfall's walking trail—support and what do they not support? The ranking is based on the ease of accessing the documents, not on how scary the locations are, and the maps are not intended as guides for on-site exploration.

Survey methods and evaluation criteria

The individual listings of rumors were not used as proof of phenomena or events, but were independently compared with materials from local government and national administrators and facility management organizations. Agreement indicates support for all core claims; partial agreement indicates a combination of support and unconfirmed information; disagreement indicates a direct contradiction; unmeasurable indicates insufficient records for direct comparison; and new facts are limited to cases where comparison is not possible and there is a significant discovery not present in the rumors. The scoring is based on a total of 100 points, consisting of 30 for source transparency, 25 for history/space, 20 for safety, 15 for novelty, and 10 for transparency of the rumor's origin; it does not represent the truthfulness of the supernatural occurrence.

1st Place: Osezaki's Sacred Pond | Partial Match (85 points)

The rumored details

The "Sacred Pond of Osezaki" in the National Haunted Map introduces the pond as "one of the seven mysteries of Izu" and notes that it "maintains freshwater" despite being close to the sea. On the other hand, it also includes stories of a curse that causes death or mental illness to anyone who catches or harms the fish in the pond, and of a male ghost appearing there. The observable characteristic of freshwater is not treated as fact when it is conflated with unconfirmed claims of punishment and sightings.

Source of the rumor and date of verification

The individual entries on the external posting site "National Ghost Map" were confirmed on September 28, 2026. The descriptions of Tansui and the Seven Wonders of Izu are from the explanation on that page, while the curses and male spirits are legends and rumors posted there. No primary records indicating who first told them and when could be obtained, so they are treated as secondary postings or of unknown origin.

• Nationwide Haunted Map - Osezaki's Sacred Pond(Confirmed on 2026-09-28) — One of the Seven Wonders of Izu, it has long been known as the sacred pond of Ose Shrine (Hikitechikara-no-Mikoto Shrine). It is said that anyone who catches or harms the fish in this pond will die or suffer a mental breakdown.

Things that could be confirmed from official and primary source materials

Numazu City's "100 Treasures of Numazu" lists the Kamiike Pond at Osezaki as a component asset, explaining that it is one of the Seven Wonders of Izu because it is a freshwater pond located close to the sea. Its location is clearly stated as Nishiura Eri, Numazu City. The Izu Peninsula Geopark also notes that the Kamiike Pond is freshwater, and states that the reason for its formation as a freshwater pond is unknown. While both publicly available documents support the properties of the water and its cultural name, they do not acknowledge any curse on the fish in the pond or any sightings of a man.

• Numazu City - "Osezaki," one of Numazu's 100 Treasures(Confirmed on 2026-09-28) — The sacred pond at the tip of the cape is considered one of the Seven Wonders of Izu because, despite being so close to the sea, it is a freshwater pond.
• Izu Peninsula Geopark, Osezaki(Confirmed on 2026-09-28) — At the tip of Osezaki, there is a pond called Kamiike. It is unknown why this pond is a freshwater pond despite being so close to the sea.

Points of agreement/contradictions

The descriptions in the source material, "one of the seven mysteries of Izu" and "maintaining fresh water," match those of Numazu City regarding the same subject. However, the detail that "seawater blows in on days when the sea is rough" cannot be determined solely from the city's description. Regarding the causal relationship between harming fish and subsequent death or mental illness, and the male ghost, there are no records that can be directly compared in either of the publicly available documents.

The rumored atomic claim	Matching results	reason	Corresponding documents
One of the Seven Wonders of Izu	support	Numazu City is considered one of the Seven Wonders of Izu because it is a freshwater pond located very close to the sea.	Numazu City - "Osezaki," one of Numazu's 100 Treasures
It maintains freshwater	support	Both Numazu City and the Izu Peninsula Geopark designate Kamiike Pond, which is close to the sea, as a freshwater pond.	Numazu City - Numazu's 100 Treasures: "Osezaki" and Izu Peninsula Geopark - Osezaki
Anyone who takes or harms the fish in the pond will either die or suffer a mental breakdown.	Unconfirmed	While the content of the legend can be read at the source, there are no personal records or independent documents showing causal relationships.	No official data available for direct comparison.
A male ghost appears	Unconfirmed	Beyond the rumors circulating at the source, we were unable to confirm the exact date and time of the incident or any independent observation records.	No official data available for direct comparison.

Alternative interpretation

The rarity of seaside freshwater ponds and the fact that the source of their water remains unknown are separate issues. An unknown water source cannot be reinterpreted as proof of a curse. While it's possible that the norm of treating fish with respect was conveyed as a strong warning, the origin of the legend could not be determined in this study.

Scope and limitations of the investigation

Documents from Numazu City and the Geopark describe the properties and topography of the freshwater pond, but do not include long-term water quality observations, personal records of fish being harmed, or eyewitness accounts of the man. The original source and first publication date of the story are unknown, and the conditions and effects of seawater inflow have not been measured on-site. The map shows a representative point of the pond and is not a guide to navigating the temple grounds.

Verification results: Partial match

Independent Numazu City documents support two specific explanations: the freshwater pond and the Seven Wonders of Izu. Therefore, there is agreement in that respect. However, details regarding the curse on the fish, the male spirit, and the inflow of seawater during storms cannot be confirmed. Because the supported natural and cultural aspects coexist with the unconfirmed supernatural phenomena and causal aspects, it is considered a partial agreement, and the judgment does not affirm the supernatural phenomena themselves.

Document Quality Score

Source transparency	27/30	Numazu City and the geopark describe the freshwater pond independently, and the original legend cannot be confirmed.
Historical and spatial context	20/25	The seaside freshwater pond and its position as one of the Seven Wonders of Izu can be interpreted separately based on topographical data.
Safety information	17/20	The geopark has posted information about the collapse of the eastern trail, highlighting the need to verify the current situation.
Newness of information	14/15	The geopark's hazard information is dated as of July 2026, but the date of the pond survey is unknown.
Transparency of the source of rumors	7/10	While the source of the rumors can be read on individual pages, it's impossible to track down the origin of the curse or the people who experienced it.
total	85/100	This is the overall quality of the materials. It does not represent the degree of truthfulness or danger associated with the supernatural phenomena.

Safety information and maps

The Izu Peninsula Geopark will be informing visitors that as of July 2026, the footpath on the east side of Osezaki is impassable due to a landslide. Prioritize the latest information posted by the administrator, do not enter shrine grounds or ponds without permission, and do not touch the fish. The dots on the map are for identifying ponds and do not guarantee passable routes.

Map location: The representative point for the pond area labeled "Kamiike" on the publicly available map. It is not a footpath or an entrance to the temple grounds.

Check the area around Osezaki's sacred pond on Google Maps.

2nd Place: Maruyama Dam | Measurement Undetermined (81 points)

The rumored details

The Maruyama Dam entry in the nationwide paranormal map states that "many people died during the dam construction" and explains it in connection with the memorial monument. It also mentions rumors that "a male ghost appears there." It also notes the height of the bridge and the importance of being careful of the railings, but these are all claims made in the text, and the number of casualties, the date of the accident, the entity that erected the monument, and the date of any sightings cannot be determined from this page alone.

Source of the rumor and date of verification

I directly checked the Maruyama Dam individual page on the "National Haunted Map" on September 28, 2026. It is an example of an external secondary posting based on user submissions, and the primary record of the specific claim of death during construction, as well as the original narrator, are not clearly indicated. It is treated as a separate voice from the official history page, and the posting of the rumor itself is not considered proof of death or paranormal activity.

• Nationwide Haunted Map - Maruyama Dam(Confirmed on 2026-09-28) — There were many casualties during the dam construction, and there is a memorial monument to honor them. Also, because there were many suicides by hanging, it is rumored that the spirits of those who committed suicide and those who died in the line of duty appear there.

Things that could be confirmed from official and primary source materials

The Maruyama Dam Management Branch of the Chubu Regional Development Bureau of the Ministry of Land, Infrastructure, Transport and Tourism records the history of the Maruyama Dam as follows: construction began in October 1943, construction was halted in May 1944 due to the war, full-scale construction resumed in September 1951, and all construction was completed in March 1956. The branch's location is approximately 90 kilometers upstream from the mouth of the Kiso River, with Yaotsu Town in Kamo District, Gifu Prefecture on the right bank and Mitake Town on the left bank. While the history shows the progression of the construction period, it does not provide records to support the number of casualties in the line of duty or the existence of a memorial monument and the spirit of a man.

• Ministry of Land, Infrastructure, Transport and Tourism - The History of Maruyama Dam(Confirmed on 2026-09-28) — October 1943 (Showa 18): Construction started by Nippon Hassoden Co., Ltd. May 1944 (Showa 19): Construction suspended due to the Pacific War May 1951 (Showa 26): Kansai Electric Power Co., Inc. took over due to power company reorganization September: Full-scale construction commenced
• Ministry of Land, Infrastructure, Transport and Tourism - About Maruyama Dam(Confirmed on 2026-09-28) — Maruyama Dam is located approximately 90 km upstream from the mouth of the Kiso River and occupies about half of the Kiso River's drainage basin.

Points of agreement/contradictions

The construction period can be traced back to specific years in national records. However, the source of the information does not specify the number of casualties or the construction period covered, and the history documents viewed by the management branch office do not contain records of the number of deaths or the erection of the monument. The lack of documentation cannot be used as proof of non-existence. Regarding the sighting of a male ghost, there is a lack of records, date, time, and location to verify the same event.

The rumored atomic claim	Matching results	reason	Corresponding documents
Many people died in the line of duty during the dam construction.	Unconfirmed	The administrator's history shows the start and completion dates of construction, but does not include the number of fatalities or accident records.	No official data available for direct comparison.
In connection with the memorial monument	Unconfirmed	Although the published text mentions the monument, the inscription, the person who erected it, and the objects of the memorial cannot be identified independently.	No official data available for direct comparison.
A male ghost appears	Unconfirmed	There are no records of the date and time of the incident or any separate eyewitness accounts, making it impossible to estimate the presence or absence of supernatural phenomena from the construction history.	No official data available for direct comparison.

Alternative interpretation

The long construction period and the interruption during wartime cannot be simply attributed to a tragedy surrounding the construction. The mention of a monument also fails to definitively identify the object of the memorial without an inscription or identification by the administrator. While mountainous terrain, visibility, and sound conditions may influence the interpretation of the sightings, this cannot be definitively determined as a cause due to the lack of individual testimonies.

Scope and limitations of the investigation

The Ministry of Land, Infrastructure, Transport and Tourism documents that could be confirmed were dam location, use, and construction timelines, not individual workers' compensation ledgers or monument ledgers. The source also lacks specific numbers of people, accident dates, and monument identification information, so the correspondence between those who died in the line of duty and the memorial monuments remains unverified. The map coordinates are representative points matched to dam features on publicly available maps and do not indicate bridge railings or accessible points.

Verification result: Unmeasurable

The existence of an official construction timeline does not support the rumor that "many workers died in the line of duty." Since there are no direct, independent records regarding the existence and target of the memorial monument, nor the sighting of the man, neither support nor clear counter-evidence can be established. While the facility in question can be identified, it does not reach the core of the rumor that needs to be investigated, and therefore remains unmeasurable.

Document Quality Score

Source transparency	26/30	While the history and specifications of the Ministry of Land, Infrastructure, Transport and Tourism's branch offices can be read, the number of people who died in the line of duty and the inscriptions on the memorials are not available.
Historical and spatial context	21/25	The construction context is rich because it can be divided into periods from the interruption during the war to the resumption of construction after the war.
Safety information	16/20	Maps of high ground and waterfront areas were only roughly reviewed, and there is no recent information on traffic restrictions.
Newness of information	12/15	The branch office's timeline has been updated to reflect its long history, but the exact date the rumor originated cannot be determined.
Transparency of the source of rumors	6/10	While the source has individual pages, there are no sources for the original construction-related documents.
total	81/100	This is the overall quality of the materials. It does not represent the degree of truthfulness or danger associated with the supernatural phenomena.

Safety information and maps

Maruyama Dam is an operational facility; please follow the latest information from the administrator regarding areas accessible for viewing and road restrictions. Nighttime exploration at high altitudes or near the waterline is not recommended, and do not cross fences or restricted areas. The map shows a representative point of the dam itself and does not permit entry or parking on bridges.

Map location: The representative point of the structure labeled as Maruyama Dam on publicly available maps. This is not the bridge or the entrance to the dam site.

Check the area around Maruyama Dam on Google Maps.

3rd Place: Akame Forty-Eight Waterfalls | Unmeasurable (76 points)

The rumored details

The Akame 48 Waterfalls section of the National Haunted Map lists rumors of a male ghost and a paranormal photograph, stating that "ghosts and will-o'-the-wisps are frequently sighted." It further adds that "many people commit suicide by jumping off the falls." The source also mentions that giant salamanders inhabit the valley, but since it does not provide the time, number, or original story regarding the strange occurrences or deaths, each claim should be treated as a rumor.

Source of the rumor and date of verification

I checked the individual page for Akame 48 Waterfalls on the external website "National Haunted Map" on September 28, 2026. It is a secondary publication example of user-submitted posts compiling sightings, photos, and death stories, but there are no references to the original reporter or official death statistics. Since the purpose of the material differs from the facility manager's information, it is presented as a rumor of unknown origin.

• National Haunted Map: Akame Forty-Eight Waterfalls(Confirmed on 2026-09-28) — This place has long been known as a suicide spot due to the large number of people who have jumped to their deaths. Ghosts and will-o'-the-wisps are frequently sighted here. It is said that it is best not to take pictures here because so many paranormal photos are taken here.

Things that could be confirmed from official and primary source materials

The Akame Forty-Eight Waterfalls management website describes a 3.3-kilometer walking trail through the valley formed by the Takigawa River and the forest, and states that there are 23 named waterfalls, including the plunge pools. It notes that "forty-eight" is not the exact number of 48 waterfalls, but rather a name that expresses the large number of waterfalls. The site also provides information on summer and winter opening hours, the absence of streetlights in the valley, and the areas accessible during the light-up event. However, this is tourist and management information and not an independent record of ghost or will-o'-the-wisp sightings or the number of people who have jumped off the falls.

• Akame Forty-Eight Waterfalls Valley Preservation Association / About Akame Forty-Eight Waterfalls(Confirmed on 2026-09-28) — The approximately 3.3km circular path connecting the waterfalls is a walking trail, allowing visitors to enjoy the waterfalls amidst the vibrant scenery of each season, including cherry blossoms, fresh greenery, and autumn leaves.

Points of agreement/contradictions

The eyewitness accounts and paranormal photographs posted cannot be confirmed or denied based solely on the administrator's descriptions of the walking trails and waterfalls. The claim that "many people commit suicide by jumping" is also invalid because there is no period or number of incidents to compare, and the descriptions on the administrator's website cannot be used as a substitute for death statistics. The approximately 3.3-kilometer walking route shown in the administrator's materials helps to understand the setting, but it is not a fact that directly matches the specific claims of paranormal activity.

The rumored atomic claim	Matching results	reason	Corresponding documents
Ghosts and will-o'-the-wisps are frequently sighted.	Unconfirmed	The source does not have the date of the incident, observation conditions, or independent testimonies, and the administrator's records do not deal with eyewitness accounts.	No official data available for direct comparison.
Ghost photo	Unconfirmed	Due to the lack of original images and shooting conditions that can be examined, independent comparison of the photographs is not possible.	No official data available for direct comparison.
Many people commit suicide by jumping off buildings.	Unconfirmed	Without specifying the period and number of cases, the administrator's tourist information cannot be treated as death statistics.	No official data available for direct comparison.

Alternative interpretation

Because the gorge consists of multiple waterfalls and a long trail, rumors lacking details such as "which waterfall and at what point was it seen?" make it difficult to pinpoint the exact location. While darkness and the sound of water may alter the impression of photographs and visual/auditory perceptions, we do not have the original images or photographic conditions. We also do not intend to use the administrator's legend as evidence for individual sightings.

Scope and limitations of the investigation

The acquired management documents describe the walking routes, the number of waterfalls, operating hours, and entry areas, but do not include accident logs or eyewitness reports. The rumors page also lacks date, time, and original photographic data, making it impossible to verify the number of fatalities or the content of the images. The map refers to publicly available map features near the gorge entrance and does not indicate the location or accessibility of each waterfall.

Verification result: Unmeasurable

Regarding the core elements of the rumors—ghosts, will-o'-the-wisps, photographs, and death tolls—there are no independently verifiable dates, records, or figures. While the topography and operating hours provided by the manager are helpful in describing the subject, they do not support the core of the rumors. No counter-evidence was obtained, and based on the materials reviewed, it is impossible to determine the truth.

Document Quality Score

Source transparency	23/30	While the management organization provides information on the canyon's structure and usage, there are no primary sources of eyewitness accounts.
Historical and spatial context	19/25	The descriptions of the walking routes and the number of waterfalls make it less likely to mistake a wide gorge for a single point in time.
Safety information	17/20	The management will clearly indicate the areas of the valley that lack streetlights and the areas that are accessible during nighttime illuminations.
Newness of information	10/15	The operating hours are as currently advertised, but the date of the rumored photos and sightings remains unknown.
Transparency of the source of rumors	7/10	While the rumors can be read directly, the original images of the photos and the source of the story cannot be traced.
total	76/100	This is the overall quality of the materials. It does not represent the degree of truthfulness or danger associated with the supernatural phenomena.

Safety information and maps

The park managers inform visitors that there are no streetlights in the gorge and that access is restricted even during nighttime illuminations. Check the latest information on opening hours, closures, and weather conditions, and do not enter outside of opening hours or in restricted areas. The representative points on the map do not guarantee safe routes throughout the entire waterfall area.

Map location: A representative point near Akame Falls Aquarium on the publicly available map, at the entrance to the gorge. It is not the center of the entire waterfall area.

Check the area around Akame 48 Waterfalls on Google Maps.

What I learned by crossing locations

At Osezaki, Numazu City provided concrete explanations for its "freshwater despite being a seaside location," which is considered one of the Seven Wonders of Izu, but the curse on fish remained unconfirmed. At Maruyama, a construction timeline including the wartime interruption by the administrator was obtained, but this alone is insufficient to determine the rumors of casualties or the memorial monument. At Akame, the length of the promenade and operating hours were confirmed, but there were no original records to compare with eyewitness accounts or photographs. The common boundary is to avoid substituting the existence of the waterfront and management information for evidence of supernatural occurrences.

summary

Of the three locations, the only ones where independent sources and some claims directly overlapped were the freshwater pond and cultural designation at Osezaki. Curses are not included in these results. The number of casualties, monuments, and sightings at Maruyama Dam, and the number of sightings, photographs, and deaths at Akame Forty-Eight Waterfalls, could not be measured from the available materials. The absence of official documentation in either case is not considered proof of non-existence. Management information and maps were used for safety and object identification, and if the original stories or primary records of rumors are found, the judgment will be revised on a claim-by-claim basis.

FAQ

Is the partial agreement at Osezaki proof of a curse?

No. Numazu City can only confirm the existence of a freshwater pond by the sea and the name "Seven Wonders of Izu," but the causal relationship between what happens to people who harm the fish remains unconfirmed.

If the accident isn't mentioned in official documents, does that mean the rumors are false?

No. Maruyama's management timeline and Akame's user guide are not accident ledgers, so simply omitting information does not mean they do not exist. The number of people, date, and primary record are required separately.

Is it possible to reach the waterfront at night from the location on the map?

Maps are for general reference only and do not indicate access permits or safe routes. Always prioritize administrator operating hours, regulations, landslide information, and on-site signage.