A morass is a mushy, muddy patch of ground that you might find in a bog. In other words, it's something you probably don't want to get stuck in.
The noun morass comes from the Dutch word moeras, meaning "marsh" or "fen." More metaphorically, just like its synonyms mire and quagmire, morass refers to anything that bogs you down, overwhelms you, and hinders your progress — like red tape, for example. You might refer to a "political morass" when the government cannot seem to pass legislation. Whether a morass is physical or metaphorical, it's a sticky mess you'll most likely want to avoid.