The Oshima Peninsula (渡島 半島 Oshima-hantō) is the southernmost part of Hokkaidō, the northernmost of the Japanese islands.
A narrower interpretation is to draw a line connecting Suttsu on the Sea of Japan and Oshamambe on Uchiura Bay.
Oshima Peninsula is home to several active volcanoes such as Mount E and Hokkaido Koma-ga-take.
The peninsula is home to two cities: Hakodate and the smaller adjacent Hokuto, as well as numerous small fishing and agricultural towns.
[3] The peninsula has an active Ussuri brown bear population, which have historically caused major damages to livestock and crops, and thus have been indiscriminately hunted for over 120 years.