inland waters; territorial waters; local run-off
Refers to bodies of water within a country's land territory, including rivers, lakes, and internal seas, as well as territorial waters. Also used in hydrology for local run-off.
内水航行は国際法で保護されている。
Navigation on inland waters is protected under international law.
この地域の内水は農業用水として利用されている。
The local run-off in this area is used for agricultural water.
Compound of 内 (inside, within) and 水 (water). The term is used in legal and geographical contexts to denote waters within national boundaries.