The pond is technically a reservoir caused by a natural damming event, rather than a traditional lake.
The protruding dead trees are remnants of the forest that existed in the valley before the 1915 eruption.
The water temperature remains consistently low year-round, which has helped preserve the submerged timber.
The pond's depth has been significantly reduced over the last century due to the accumulation of silt and volcanic debris from upstream.
Mount Yakedake, the volcano responsible for the pond's creation, remains one of the most active volcanoes in the region.
Taisho Ike Pond was created in 1915 when the eruption of Mount Yakedake dammed the Azusa River with volcanic mudflows. The pond is characterized by the presence of submerged, weathered tree trunks that protrude above the water's surface. It serves as the primary entrance point for many hikers entering the Kamikochi valley from the south. The water is notably clear, reflecting the surrounding peaks of the Northern Japan Alps, including Mount Hotaka. The sediment levels in the pond are gradually increasing, leading to a slow decrease in the pond's overall depth over time. It is located at an elevation of approximately 1,500 meters above sea level. The surrounding forest is composed primarily of coniferous trees that change color significantly during the autumn season.
The wooden boardwalk near the bus stop provides the classic vantage point featuring dead trees with Mount Yakedake in the background.
Walk the nature trail from the pond toward the Kappa Bridge for the best panoramic views of the valley.
Visit early in the morning to see the water at its calmest, which provides the clearest reflection of the mountains.
Prepare for rapid weather shifts by carrying waterproof layers, as mountain conditions change quickly.
Attempting to swim or enter the water, as the temperature is dangerous and the bottom contains unstable volcanic mud.
The area is inaccessible to private vehicles and closed to the public during winter, typically from mid-November to late April.
Do not remove stones or vegetation; stay strictly on marked paths to protect the fragile wetland ecosystem.
