井泉[seisen] (water) well
黄泉[kousen] underground spring
温泉[onsen] spa
九泉[kyuusen] hades
源泉[gensen] source

古泉学[kosengaku] numismatics
鉱泉[kousen] mineral spring
泉貨紙[senkashi] reclaimed paper
泉水[sensui] fountain

谿間[keikan] ravine
谿谷[keikoku] valley
谿声[keisei] sound of a valley stream
谿壑[keigaku] ravine

谿澗[keikan] mountain stream
谿水[keisui] mountain stream
谿泉[keisen] a spring that gushes forth from a valley