ライン川[raingawa] (river) Rhine
安倍川餅[abekawamochi] rice cakes (mochi) with Kinako
川床[kawadoko] riverbed
河川[kasen] rivers
江川る[egawaru] to (try to) act like a big-shot

香川県[kagawaken] Kagawa prefecture (Shikoku)
三途の川[sanzunokawa] Sanzu River (Buddhist equivalent of the River Styx)
山川[sansen] mountains and rivers
四川[shisen] Sichuan (China)
小川[ogawa] streamlet

小滝[otaki] cascade
滝口[takiguchi] top of a waterfall
滝川[takigawa] rapids
滝つぼ[takitsubo] basin under a waterfall

滝登り[takinobori] (fish) climbing (swimming) up waterfall
白滝[shirataki] noodles made from konnyaku
雌滝[medaki] the smaller waterfall (of the two)
男滝[odaki] greater waterfall (of the two)