01 / Fossil forest park
Of 137 fossil trunks examined,130 were the tree Wataria.

Around the site of the Ota no Watashi river crossing on the Nakasendo, the bed of the Kiso River exposes strata about 19 million years old. A 1994 drought revealed about 400 upright fossil trunks; Hokkaido University and others examined 137 and identified 130 as Wataria, an extinct species related to obeche.
- Strata about 19 million years old
- 130 of 137 trunks were Wataria
- About 400 found in the 1994 drought


