01 / Dammed pond
The tourism association says Showa-shinzan dammedthe Sobetsu River and formed Shinzan-numa Pond.
The Sobetsu tourism association says that the formation of Showa-shinzan dammed the Sobetsu River and created Shinzan-numa Pond. At the pond's observation deck, natural materials are preserved in which strata show deposits from the Donkoro-yama eruption, said to be about 20,000 years ago, and the later eruptions.
- Tourism association: the Sobetsu River was dammed
- Donkoro-yama eruption said to be about 20,000 years ago