河内[hanoi] Hanoi
運河[unga] canal
応急渡河[oukyuutoka] hasty crossing
黄河[kouga] Yellow river (in China)
河港[kakou] river port

河鹿[kajika] kajika frog (Buergeria buergeri)
河床[kashou] riverbed
河水[kasui] river water
河川[kasen] rivers
河童[kappa] kappa (mythical water-dwelling creatures)

峡谷[kyoukoku] glen
溪谷[keikoku] valley
千仭の谷[senjinnotani] bottomless ravine
谷あい[taniai] valley
谷川[tanigawa] mountain stream

谷底[tanisoko] bottom of valley or ravine
幽谷[yuukoku] deep ravine
蟀谷[komekami] temple (of the forehead)
谷まる[kiwamaru] to terminate