Nihoner

“Boundary stone” in Japanese

Short answer
標石 hyouseki ひょーせき

Boundary stone in Japanese is “標石” (hyouseki). Full meaning: stone signpost, milepost, boundary stone; stone marker (benchmark, triangulation pillar, etc.).

Looking for the other direction? Search any Japanese word in the Nihoner lexicon, or practise what you have learned in the learning games.