35°18′53″N 139°31′39″E / 35.31472°N 139.52750°EIsshōmasu Site ( Japanese: 一升桝遺跡 [1]) is an archaeological site that is located in Kamakura, Kanagawa Prefecture. [2] The site was designated a National Historic Site of Japan in 2007. [3] It is a Kamakura period earthworks beside the road, half a kilometre from Gokuraku-ji. [4]