The term BOG, MARSH can be summarized by two crossword solutions: SWAMP (5 letters) and SLOUGH (6 letters). A bog is a type of wetland that is often found in cold climates and is characterized by spongy, acidic soil and a layer of peat. A marsh is a type of wetland that is usually found in warmer climates and is characterized by shallow water and grasses. A SLOUGH is a type of wetland that is similar to a marsh but is usually deeper and has more standing water. A SWAMP is a type of wetland that is similar to a marsh but is usually even deeper and has more trees and shrubs.