a kind of bog or marsh containing thick layers of decaying vegetable matter, mosses, etc., found esp. in Canada and Alaska and often overgrown with moss
See muskeg in American Heritage Dictionary 4
(mŭsˈkĕgˌ) also mas·keg(măsˈ-)
noun
A swamp or bog formed by an accumulation of sphagnum moss, leaves, and decayed matter resembling peat.