Oshima (渡島) 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.

Geography

Cities

1. Hakodate (capital)

Districts

• Matsumae

2. Matsumae

3. Fukushima

• Kamiiso

4. Shiriuchi

5. Kikonai

6. Kamiiso

• Kameda

7. Ono

8. Nanae

• Kayabe

9. Shikabe

10. Sawara

11. Mori

• Yamakoshi

12. Yakumo

13. Oshamanbe