National highway near 's hilly region in existing Hokkaido designated historic site 's Omusaro Ruins Park. Early Jomon period from Epi-Jomon period, Okhotsk Culture period, Satsumon period, Ainu period and ten thousand years as much as interval 's unbroken each period 's life 's traces are left. Present even without being able to be completely buried indigenous people 's pit dwelling remains as many as 208 houses are left. Far away beyond 's Sakhalin from drift ice 's sea crossing came northern people 's ruins also exist.