水すい準じゅん原げん点てん

noun

primary benchmark; fundamental benchmark

Technical surveying term for a fixed reference point used as the basis for elevation measurements.

• 日本にほん水すい準じゅん原げん点てんは国こっ会かい議ぎ事じ堂どうの近ちかくにある。

  The Japanese primary benchmark is located near the National Diet Building.