Hiyama Subprefecture (檜山振興局, Hiyama-shinkō-kyoku?) is a subprefecture of Hokkaidō, Japan located on the Oshima Peninsula on the Sea of Japan side. It includes Okushiri Island. It was established in 1897.
Hiyama Subprefecture (檜山振興局, Hiyama-shinkō-kyoku?) is a subprefecture of Hokkaidō, Japan located on the Oshima Peninsula on the Sea of Japan side. It includes Okushiri Island. It was established in 1897.