Bothnia or Bothnian may refer to: Gulf of Bothnia, a gulf of the Baltic Sea between Sweden and Finland Bothnian Bay, the northernmost waters of the gulf Bothnian Sea, the southernmost waters of the gulf Provinces in Sweden and Finland named after the gulf: Ostrobothnia (disambiguation), multiple entities West Bothnia, located west of the gulf North Bothnia, located northwest of the gulf "Rear Bothnia", or Peräpohjola, southern part of Finnish Lapland SS Bothnia, transatlantic steamship (1874–99) Bothnia Line, high speed railway in northern Sweden Bothnian Highway, a main road between Kaskinen and Seinäjoki Similar spellings Bosnia Boothia (disambiguation) Botany Bay