The Oshima Peninsula (渡島 半島 Oshima-hantō) is the southernmost part of Hokkaidō, the northernmost of the Japanese islands.[1] Where the peninsula starts is open to interpretation. A more generous interpretation is to draw a line southeast from Ishikari Bay across the Ishikari Plain to Yūfutsu District, Hokkaido. A narrower interpretation is to draw a line connecting Suttsu on the Sea of Japan and Oshamambe on Uchiura Bay. This narrow interpretation encompasses the subprefectures of Oshima and Hiyama.
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At its southern end it forks into the southwest-pointing Matsumae Peninsula and the southeast-pointing Kameda Peninsula. These two peninsulas face Tsugaru and Shimokita Peninsulas of Honshū across the Tsugaru Strait. The Ōnuma Quasi-National Park is located on the peninsula.[1]
The terrain of the peninsula is mountainous, with settlements mostly located in flat, lowland areas. Oshima Peninsula is home to several active volcanoes such as Mount E and Hokkaido Koma-ga-take. The area also contains several onsen hot springs. The peninsula is home to two cities: Hakodate and the smaller adjacent Hokuto, as well as numerous small fishing and agricultural towns.[1]
Matsumae Castle, the northernmost castle in Japan and only castle on the island of Hokkaido, is located on the Oshima peninsula.
The climate is humid continental (Dfa/Dfb) except along the coast of the Matsumae Peninsula where it is oceanic (Cfb,) The hardiness zone is high for an east-coast Northern Hemisphere location at such a latitude and ranges up to 8b on the Matsumae.
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List of mergers in Hokkaido |
General |
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National libraries |
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