Ichirizuka (一里塚) are historic Japanese distance markers akin to milestones. Comprising a pair of earthen mounds (tsuka or zuka) covered in trees and flanking the road, they denoted the distance in ri (3.927 kilometres (2.440 mi)) to Nihonbashi, the "Bridge of Japan", erected in Edo in 1603.[3] Ichirizuka were encountered and described by Engelbert Kaempfer, c.1690: "serving as a milestone are two hills, facing each other, which are raised up on both sides of the road, and planted with one or more trees."[4][note 1]
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