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High-Tech Channel Hitachi High-Tech GLOBAL

The distance of 1 ri differed by region

Base data: length.
1 ri = 36 cho ≒ 3.927 km

Meiji government combined it to about 4 km

In the past, “1 ri takes 1 hour” was common knowledge. The 1 ri decided by the government was 36 cho (about 4 km) and it was the distance that could be walked in 1 hour. However, the definition of 1 ri differed depending on the highway in olden days of Edo. This is because it was decided by walking effort rather than distance.