渡岛半岛（日语：渡島半島／おしまはんとう Oshima hantō */?）为日本北海道西南部的半岛，又可细分为濒临日本海的松前半岛、以及濒临太平洋的龟田半岛。该半岛的中心都市为函馆市。大沼国定公园位于渡岛半岛东侧。[1]
渡岛半岛的位置
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