Tsutanuma is the largest of the seven ponds known as 'Tsuta Nana-numa' (Tsuta Seven Ponds).
The pond was formed by volcanic activity associated with the Towada caldera, which created a landscape of several interconnected marshy basins.
The surrounding forest is one of the largest remaining old-growth Japanese beech (Fagus crenata) forests in the Tohoku region.
In autumn, the beech leaves turn a deep, reflective red that creates a 'burning' effect on the surface of the pond at sunrise.
The water levels are fed by groundwater and seasonal snowmelt, contributing to the high clarity of the pond.
Tsutanuma Pond is a caldera lake located in the Towada-Hachimantai National Park, recognized primarily for its striking mirror-like reflections of the surrounding beech forest. It is the largest of the seven ponds that comprise the Tsuta Nana-numa cluster, which are connected by a system of walking trails. The pond is enclosed by dense Japanese beech trees, providing a vivid seasonal palette ranging from lush green in summer to vibrant crimson in autumn. The water remains exceptionally clear and still due to minimal surface disturbance from the surrounding topography. Visitors traverse a dedicated wooden boardwalk that loops around the perimeter to protect the delicate wetland ecosystem.
The designated wooden observation deck located at the edge of the pond nearest the entrance.
Bring a high-quality polarized lens filter to minimize glare on the water surface and enhance the reflection.
Wear moisture-wicking layers, as the forest canopy keeps the area significantly cooler and damper than the surrounding open roads.
Prepare for midges and mosquitoes by using insect repellent, especially during the humid summer months.
Do not wander off the marked paths, as the surrounding terrain includes marshland and unmarked, difficult-to-navigate forest floors.
Access to the pond area can be restricted during winter months due to heavy snowfall and road closures leading to the Tsuta Onsen vicinity.
Stay strictly on the designated boardwalks to avoid damaging the peat moss and native wetland plants.
