The Takizawa stone circle in Gunma’s Shibukawa city is ten thousand years old

Takizawa stone circle si photo credit: Shibukawa City Education Board

The Jomon site is believed to be ten thousand years old, according to Shibukawa city (see their webpage).

Source and reference

縄文時代, p. 74
ジヨウモン ジダイ レツトウ ノ コウコガク
能登健