The lake serves as a water source for the agricultural fields of the surrounding Inokashira district.
It is one of the few locations where the 'Diamond Fuji' effect is visible twice a year, typically in April and August.
The 3.3-kilometer circumference trail takes approximately one hour to walk at a steady pace.
The water temperature remains relatively stable due to its status as a reservoir fed by mountain runoff.
The lake attracts a large population of wild birds, making it a popular spot for birdwatchers.
Lake Tanuki is a man-made reservoir located on the Asagiri Plateau, specifically engineered to provide irrigation water for the surrounding Fujinomiya region. The lake is renowned for its reflection of Mt. Fuji, which is visible across its calm surface on clear days. Visitors can complete a full circuit of the lake via a flat, paved 3.3-kilometer walking path. The area is situated within the Fuji-Hakone-Izu National Park. The lake was originally a swampy marsh known as Tanuki-numa until it was expanded into a reservoir in the mid-20th century. Local facilities include a well-maintained campground and rental services for bicycles and boats. The site is a primary location for observing the 'Diamond Fuji' phenomenon, where the rising sun aligns perfectly with the summit of the mountain.
The northern shore boardwalk offers the clearest unobstructed view of Mt. Fuji's reflection in the water.
Bring a tripod if you plan to capture the sunrise reflection, as the best lighting occurs before dawn.
Wear comfortable walking shoes to complete the full loop of the lake trail.
Check local weather forecasts specifically for Mt. Fuji visibility, as cloud cover frequently obscures the summit.
Do not attempt to swim in the lake, as it is a reservoir managed for irrigation and recreation is restricted to designated areas.
Maintain silence near camping and fishing zones; carry out all trash as there are limited public disposal bins.
