The contour of all the coastlines and continental rivers was drawn in detail from Cape Soya in the north to Yakushima Island in the south, from Kunashiri Island in the east to the Goto Islands in the west.
北は宗谷岬、南は屋久島、東は国後島、西は五島列島までの海岸線および内陸河川の形状をつぶさに描く。