Oshima Peninsula, Mountainous peninsula in southern Hokkaido, Japan
Oshima Peninsula is the southernmost extension of Hokkaido, divided into several distinct peninsulas including Matsumae and Kameda that face toward Honshu. Coastal cliffs, forested ridges, and sheltered bays create varied terrain across this region.
This area became a key maritime crossroads in medieval times, with Matsumae Castle serving as Japan's northernmost fortress to control passage between the islands. The castle dominated regional power for several centuries.
Fishing communities here maintain daily practices tied to the sea, with boats and nets shaping the landscape and local routines. The heritage of the Ainu people is woven into place names and how inhabitants relate to the natural surroundings.
The region is served by regular trains and buses, with Hakodate as the main transportation hub for all directions. Following the main roads along the coasts gives clear orientation for exploring.
Several active volcanoes rise across the landscape, including Mount E and Hokkaido Koma-ga-take, shaping both the terrain and the geothermal character of the region. Natural hot springs emerge at different locations, revealing ongoing volcanic activity beneath the surface.
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