Geographically the eastern end of Tokachi County of Tokachi Province, Cape Soya (north), Cape Kamui (west) and Cape Erimo (south) were regarded as Shishi (the northern, southern, eastern, and western boundaries of a tract of land).
地理的には十勝国十勝郡の東端と宗谷岬（北）・神威岬（西）・襟裳岬（南）の3つの岬を四至としていた。