Oshima Subprefecture

Oshima (渡島総合振興局) is a subprefecture of Hokkaido Prefecture, Japan. As of 2004, it had a population of 456,621 and an area of 3,715.38 km2.

Hakodate Airport is located in the City of Hakodate.

Geography
The subprefecture is located on the Oshima Peninsula.

History

 * 1897: Hakodate Subprefecture, Kameda Subprefecture, and Matsumae Subprefecture was established.
 * 1899: Hakodate Subprefecture was abolished. Kameda Subprefecture was transferred to Hakodate and renamed Hakodate Subprefecture.
 * 1903: Matsumae Subprefecture was merged into Hakodate Subprefecture.
 * 1922: Hakodate Subprefecture changed its name to Oshima Subprefecture.