01 / Pillow lava of the Asemi River
Lava thrown up by an ancient undersea volcanotook on the shape of a rugby ball.
The pillow lava in the Asemi River (汗見川) gorge formed, the town explains, when seawater entered the lava and reacted with it, giving it a pillow shape. It is a natural monument of Kochi Prefecture; the strata of the river basin are called the Sanbagawa Belt (三波川帯), where more than 30 kinds of metamorphic rock can be seen.
- A natural monument of the prefecture (town website)
- Basin strata are the Sanbagawa Belt, over 30 kinds of metamorphic rock (town website)
- The Asemi River flows about 20 km to join the Yoshino River (town website)
