三さん舎しゃ

noun

three days' march (approx. 36.5 km)

Archaic term used in the context of the ancient Chinese army. Refers to a distance of about 36.5 km, based on a day's march of roughly 12.2 km. Not used in modern Japanese outside historical or literary references.

• 古こ代だい中ちゅう国ごくの軍ぐんでは、三さん舎しゃの距きょ離りを一いち日にちの行こう軍ぐんの目め安やすとした。

  In the ancient Chinese army, a distance of three days' march was used as a guideline for a day's march.