The lake's water has a pH level of approximately 3.0, making it too acidic for most aquatic life to survive.
It is the deepest pond in the Murodo-daira area, reaching depths of about 15 meters.
The pond is a prime location for spotting the rock ptarmigan, which has been designated a 'Special Natural Monument' in Japan.
Despite its high altitude, the area features a network of underground geothermal steam vents related to the active Jigokudani volcanic valley nearby.
The lake surface remains frozen and snow-covered for nearly nine months of the year, typically melting completely by July.
Mikuriga-ike is a volcanic crater lake located at an elevation of 2,405 meters in the Tateyama Mountain Range of the Northern Japanese Alps. The pond is known for its cobalt-blue, highly reflective water that mirrors the surrounding 3,000-meter-high peaks of the Tateyama mountains. Formed approximately 10,000 years ago by volcanic activity, the lake is situated in a basin surrounded by alpine flora and rocky terrain. The water is highly acidic, preventing the presence of fish, though the area is a primary habitat for the ptarmigan, a bird protected as a national natural monument. A well-maintained stone path surrounds the pond, facilitating pedestrian access from the Murodo terminal. In early summer, the surrounding area remains covered in deep snow while the pond begins to thaw. The area is part of the Chūbu-Sangaku National Park, noted for its diverse alpine ecology and volcanic geology.
The elevated viewing deck on the northern edge of the path, which captures the pond with the Tateyama mountain range peaks in the background.
Bring polarized sunglasses to reduce glare and better see into the deep, clear water.
Carry layers, as temperatures drop rapidly with sudden mountain weather shifts even in mid-summer.
Stay strictly on the designated stone paths to protect the fragile alpine vegetation surrounding the shore.
Attempting to swim or touch the water, as the high acidity can cause skin irritation.
The area is inaccessible by public transport during winter months due to heavy snow; typically open from late spring through early autumn.
Strictly no-littering and no-collection of rocks or plants; stay on marked paths to prevent soil erosion.
