Verification of the Mannō Pond Haunting Myth with Official Documents | Correction of Rumors in Previous Articles

First, the conclusion:Regarding Mannō Pond, what can be confirmed from publicly available documents from Kagawa Prefecture is its construction and repair history, the scale of its water storage and irrigation, and the fact that it is still used as an agricultural facility. The human figures, voices, handprints, and the feeling of being drawn into the water that were discussed in the previous article are not supported by the official documents we have reviewed this time.

This article avoids simply republishing old articles about haunted places, instead separating verifiable information about locations from rumors that lack sources. Descriptions of Kagawa Prefecture are presented as summaries rather than direct quotes. We avoid outright denial of paranormal activity or repurposing administrative documents as proof, instead organizing the information in a way that allows readers to distinguish between different types of evidence.

Things that were confirmed at Mannō Pond

According to the Kagawa Prefecture's page introducing Mannō Pond, the pond was constructed during the Taihō era (701-704) by damming the upper reaches of the Kanakura River. After that, it repeatedly collapsed and was rebuilt, with figures such as Kūkai and Nishijima Hachibei being involved in its repairs. The page also explains that there was a period after the first year of the Genryaku era when the embankment was in a state of collapse for a long time, and that it was rebuilt during the Edo period and maintained as an important reservoir.

What can be gleaned from this is a local history and civil engineering history concerning water supply. While the fact that there was a levee breach in the past is something that needs to be verified, it is not possible to conclude that "voices can still be heard" or "figures appear" based solely on that event. Records of accidents and disasters and records of paranormal phenomena require different kinds of evidence.

Records of repairs to sluice gates and bottom culverts.

The public page describes the process of replacing the wooden drainpipe with a stone one in 1852, following a proposal in 1849, in order to reduce the maintenance burden. During the 1854 earthquake, water leaked from the joints of the stone drainpipe, causing it to collapse. Subsequently, a plan to excavate a tunnel through the bedrock was pursued, and the drainpipe was rebuilt in 1870.

The sluice gate and bottom culvert were designated as a nationally registered tangible cultural property in 2000. There are elements that can be observed as structures on site, such as the pentagonal voussoirs and stone decorations. Before treating the shadows and sounds at night as supernatural occurrences, it is necessary to separate them from the actual conditions that exist, such as the water supply facilities, the surrounding structure, the wind, the sound of water, and the lights of vehicles.

15.4 million cubic meters of active infrastructure

During the reconstruction project in the Showa era, the embankment was raised by 6 meters, increasing the water storage capacity to 15.4 million cubic meters. The area benefited by the project was 3,003 hectares. With the construction of intake towers, water conduits, and main canals, Mannō Pond continues to function as a facility supporting a large area of farmland.

In the 1990s, a remote centralized control system for the water intake valves was also installed. While it is a historical site, it is not a decommissioned structure intended for display. Water discharge, water levels, and management operations change in accordance with actual operation. When visiting, please prioritize visiting the public areas and following the on-site guide rather than attempting to approach and examine the equipment.

Reviewing the paranormal theories in previous articles based on their evidence.

This does not mean that these things "don't exist." It simply means that at this stage, there is insufficient evidence to publish them as fact. To make them verifiable, we would need the original data showing the same location, the date and time of recording, the unprocessed file, and independent observations from multiple people.

Reading techniques to reduce misreadings

On large bodies of water, distant light and objects on the shore may appear to shift position due to reflection. In dimly lit environments where detail is lacking, people tend to fill in the gaps by identifying outlines as faces or human figures. In reservoirs, sounds such as water discharge, wind, traffic, birds, and insects also overlap. To identify a specific sound as a "voice," one must consider not only the impression but also the frequency and recording environment.

When reading older articles, you can avoid confusion by dividing the text into three sections: the history of the place, the source of the rumor, and the observation conditions. The long history of the restoration of Mannō Pond is important, but a long history in itself is not evidence of supernatural occurrences. Conversely, the mere existence of potentially explainable environmental factors does not mean that individual experiences should be dismissed as false.

When examining photographs, first fix the horizontal orientation and shooting location on a map. Since the position of reflections on the water surface shifts even with slight changes in viewpoint, a series of photographs with the same composition is more effective than a single still image. Knowing the time of shooting and weather conditions allows you to compare the direction of the sun or lighting. If the metadata of the original image remains, it becomes easier to identify information loss due to processing or resavement.

Regarding the sound, we need to distinguish whether it came from the pond or from the downstream embankment or road. If we can record the water discharge rate and wind direction at the same time, we can later compare it with the actual sound source. The impression that "it sounded like a cry for help" is important testimony, but being able to hear words is not the same as a person actually speaking.

When claiming a handprint, the location where the car was parked, whether it was on the inside or outside of the window, and a photograph taken before touching it are important factors in the judgment. If you link it to a paranormal phenomenon without ruling out moisture, oil film, or existing dirt, it becomes impossible to re-examine it. If you are going to record the experience, it is best not to touch the object immediately after being surprised, and to take a wide-angle photo that includes the surroundings first.

Safety and reference materials for your visit

Mannō Pond is an active land improvement facility. There may be dangers at the water's edge, sluice gates, water intake facilities, and management areas. When attending events or viewing water releases, please follow the routes, fences, and entry signs indicated by the administrators or organizers. This safety information is a general warning from the editorial department of this website and is not a direct quote from the Kagawa Prefecture page.

Official pages contain not only history but also specific figures such as the beneficiary area, water storage capacity, water intake facilities, and water conduits. By checking these figures, we can understand Mannō Pond not merely as a "scary body of water," but as a facility that supports a large amount of farmland. Even in articles dealing with ghost stories, expressions that undermine the purpose and management of the facility must be avoided.

When rereading sources, be sure to check the publication date and the department responsible for the page. The Kagawa Prefecture page is an introduction to major reservoirs by the Land Improvement Division, and its purpose differs from tourist information or accident investigation reports. Understanding the responsible department and the purpose of the document will clarify to what extent the figures presented are usable and, conversely, what cannot be proven.

The term "danger" used in older articles about paranormal phenomena also distinguishes between physical danger and supernatural danger. Water depth, water discharge, falls, and management facilities are all things that require real-world safety measures. On the other hand, the degree of danger caused by supernatural phenomena is not measured in terms of how it can be assessed. Combining both into the same star rating would mislead readers into prioritizing the wrong precautions, so this article will not adopt that approach.

In the future, if any audio recordings or unprocessed video footage with identifiable dates and times are provided, they will be treated as separate verification records rather than being added to the current conclusions. Similarly, if official location information is updated, the update date and changes will be confirmed and revised. We will not simply overlay new information while leaving outdated text.

The update history will include any added materials, changed judgments, and points that could not be verified. The condition for using this revised version is that the conclusion alone will not be replaced; readers will be able to follow the reasoning behind the preceding and following statements.