Eng: Moat...

池

Battery, Moat, Pond, Pool, Reservoir

溝

Channel, Ditch, Drain, Moat, Waterway

濠

Ditch, Moat, Trench

壑

Ditch, Gully, Moat, Ravine

壕

Air Raid, Moat, Trench

塹

Chasm, Moat, Pit, Trench

護城河

Moat