A boat flat bottom is a type of vessel that has a flat bottom and no keel. The most common types of boat flat bottoms are scows, barges, soles, and sampans. A SCOW is a flat-bottomed boat with square ends and sides that is used for carrying cargo. A BARGE is a large, flat-bottomed boat used for transporting goods on canals and rivers. A SOLE is a flat-bottomed boat with pointed ends that is used for fishing or transportation. A SAMPAN is a flat-bottomed Chinese boat with a high stern and bow, used mainly for fishing and transportation.