Subprefectures of Hokkaido in the context of "Hiyama Subprefecture"

Ishikari Subprefecture (石狩振興局, Ishikari-shinkō-kyoku) is a subprefecture of Hokkaido Prefecture, Japan, located in the western part of the island. The subprefecture covers 3,539.86 square kilometres (1,366.75 sq mi) and on July 31, 2023 had a population of 2,379,802. The subprefecture takes its name from the Ishikari River, the third longest in Japan, which flows through western Hokkaido and empties into the Sea of Japan in the city of Ishikari. There are 6 cities, three towns, and one village under its jurisdiction. Sapporo is both the capital of Hokkaido Prefecture and Ishikari Subprefecture. Shikotsu-Toya National Park is located in the southern part of the subprefecture, and Shokanbetsu-Teuri-Yagishiri Quasi-National Park in the north.

Nemuro (Japanese: 根室振興局, Hepburn: Nemuro-shinkō-kyoku) is a subprefecture of Hokkaido Prefecture, Japan. Japan claims the southern parts of the disputedKuril Islands (known as the Northern Territories in Japan) as part of this subprefecture.

As of March 2009, the subprefecture has an estimated population of 84,035, and an area of 3406.23 km².

Oshima (渡島総合振興局, Oshima-sōgō-shinkō-kyoku) is a subprefecture of Hokkaido Prefecture, Japan. As of 2004, it had a population of 456,621 and an area of 3,715.38 km.

Hakodate Airport is located in the City of Hakodate.

Tokachi Subprefecture (literally "Tokachi Comprehensive Promotion Bureau") (十勝総合振興局, Tokachi-sōgō-shinkō-kyoku) is a subprefecture of Hokkaido Prefecture, Japan corresponding to the old province of Tokachi. As of 2004, its estimated population is 360,802 and its area is 10,830.99 km.

Tokachi-Obihiro Airport is in the city of Obihiro.