Oshima Subprefecture, Administrative division in southern Hokkaido, Japan.
Oshima Subprefecture is an administrative region on the Oshima Peninsula in southern Hokkaido, encompassing ten municipalities with Hakodate as the main city. The territory connects several towns and coastal communities that are economically tied through fishing, farming, and regional trade networks.
The region formed in 1897 from three separate administrative divisions that merged into one unit by 1903. This consolidation shaped the current structure and administrative identity of the subprefecture.
Festivals throughout the municipalities feature traditional dances, seafood celebrations, and seasonal ceremonies tied to local customs and the sea. These events show how deeply connected residents are to the coastal lifestyle and marine resources.
Train and bus services connect the main cities within the region, with Hakodate serving as the central transportation hub. From there, other municipalities are easily reachable by public transport.
The region has deep fishing roots with numerous ports along the coast supplying fresh seafood to markets across northern Japan. These fleets have been the economic backbone of the communities for generations.
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