Shimura Ichirizuka
The is a historic Japanese distance marker akin to a milestone, comprising a pair of earthen mounds located in what is now Itabashi, Tokyo in the Kantō region of Japan. It was designated a National Historic Site of Japan in 1922, with the designation expanded in 1935. Overview During the Edo period Tokugawa shogunate established ichirizuka on major roads, enabling calculation both of distance travelled and of the charge for transportation by kago or palanquin. These mounds, denoted the distance in ri () to Nihonbashi, the "Bridge of Japan", erected in Edo in 1603. Since the Meiji period, most of the ichirizuka have disappeared, having been destroyed by then elements, modern highway construction and urban encroachment. In 1876, the "Ichirizuka Abolition" decree was issued by the Meiji government and many were demolished at that time. Currently, 17 surviving ichirizuka are designated as national historic sites. The Shimura ishirizuka were the third on the Nakasendō highway. They are located just outside of Itabashi-juku, the first post station on that route, and were constructed by order of Tokugawa Ieyasu in 1604. The mounds each occupy an area of three by three meters, with a height of one meter, and are planted with