nm. swamp, bog, mire, morass, quagmire, slough, ooze

nm. marsh, bog; reservoir, dam

n. bog, fen; marsh, morass; mere; quagmire, swamp; flush

(n.) = water reservoir.
Ex: These school programs encourage volunteers to help protect, enhance and manage public lands such as forests, parks, water reservoirs, historical sites, nature preserves, and wilderness areas.