Explore details about location 函館市. 函館市 is a location situated within the 渡島総合振興局 alongside other areas such as 上磯郡, 函館市, 茅部郡. Additionally, some smaller parts of 函館市 include specific areas like 薬師山コース, 広域農道, 放射4-1号線 adding to the diversity of its landscape.