tidal river
Technical term used in geography and civil engineering for a river section where water level is influenced by tides.
In this tidal river, the water level changes greatly with the ebb and flow of the tide.
Compound of 感潮 (kanshō, 'tidal influence') and 河川 (kasen, 'rivers'). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.