悪水[akusui] undrinkable water
井戸水[idomizu] well water
一衣帯水[ichiitaisui] (being separated only by a) narrow strip of water
一水[issui] current (of water)
溢水[issui] inundation

飲水量[insuiryou] amount of drinking
飲料水[inryousui] drinking water
烏の行水[karasunogyouzui] quick bath
雲水[unsui] itinerant priest
塩化水素[enkasuiso] hydrogen chloride

渓間[keikan] ravine
渓谷[keikoku] valley
渓流[keiryuu] mountain stream
渓流釣り[keiryuuzuri] mountain stream fishing
厳美渓[genbikei] Genbi Gorge (Ichinoseki-shi, Iwate-ken)

雪渓[sekkei] snowy valley
猊美渓[geibikei] Geibi Gorge (Higashiyama-cho, Iwate-ken)
渓声[keisei] sound of a valley stream
渓壑[keigaku] ravine