Ichirizuka on the Old Tokaido Road. Ichirizuka are a kind of mileage marker or milestone. Instead of marking kilometers, they indicate ri which equals roughly 4 km. They are made up of a large mound of earth with a tree for shade as a resting place for travelers on the on the Old Tokaido Road, or Eastern Coastal Road. Tokaido is now both the main central train line as well as the original Shinkansen Bullet Train from Tokyo to Kyoto. But of the original trail only about 9 km still exists, most of it in Hakone.