The shogunate ordered the drawing of pictorial maps of all Japan during the Keicho period (1596-1615) and the Shoho period (1644-1648). This Shodoshima map is dated 1605, and as one of only a few surviving maps from the Keicho series, it is a very important historical document. The map was drawn with the use of the advanced survey techniques known to the Inland Sea mariners who transported stone from the island.