National Treasures & Important Cultural Properties
of National Institutes for Cultural Heritage, Japan

In Kansei 12 (1800), Inō Tadataka measured the eastern Ezo area (mainly the Pacific coast area of Hokkaido) and Ōshū Dōchū (route) for the first time and made these survey maps. Tokyo National Museum calls them Ezo-chi Jissoku -zu (the surveyed maps of the Ezo area). This map is thought to preserve the original form when it was submitted to the Shogunate. They are the folding type, with the title written with sumi on the cover page section. The titles have a certain format—Ezo area, map one: from Shiriuchi to Yamakoshinai for example. The shintotsu method (Ino's original method of copying maps) was not used for these maps. Inō made two versions: large (1: 43636 scale) and small (1: 436360) ones. The large version lacks part of the Ezo area from Shiraoi to Hirou, the Ōshū map does not have the area that could have been covered by ten maps, from Asakusa to Tsugaru Tairadate. There is a red seal on them that reads "Asakusa Bunko" (Asakusa library).

Map one: from Shiriuchi to Yamakoshinai
The surveyed coastal map of the volcano bay ranging from the present Shiriuchi-cho (town) in Kamiiso-gun (county) to the Yamakoshi District, Yakumo-cho in Hutami-gun.
Map two: from Yamakoshinai to Abuta
The surveyed coastal map of the volcano bay ranging from the present Yamakoshi District, Yakumo-cho in Hutami-gun to Abuta-cho in Abuta-gun.
Map three: from Abuta to Shiraoi
The surveyed coastal map of the volcano bay and the Pacific Ocean ranging from the present Abuta-cho in Abuta-gun to Shiraoi-cho in Shiraoi-gun. The map of the succeeding area from the Hidaka Coast to Cape Erimo is lost.
Map seven: from Hirou to Ohotsunai
The surveyed coastal map of the Tokachi Coast ranging from the present Hiroo-cho in Hiroo-gun to the mouth of the Ōtsu (Tokachi) River in Urahoro-cho in Tokachi-gun.
Map eight: from Ohotsunai to Kusuri
The surveyed coastal map of the Pacific Ocean ranging from the mouth of the Ōtsu River to the city of Kushiro-shi.
Map nine: from Kusuri to Atsukeshi
The surveyed coastal map of the Pacific Ocean ranging from the city of Kushiro-shi to Akkeshi-cho in Akkeshi-gun.
Map ten: from Atsukeshi to Nishibetsu
The surveyed coastal map of the Pacific Ocean and Notsuke-suidō ranging from Akkeshi-cho to Bekkai-cho in Notsuke-gun.