Flatboat
rectangular flat-bottomed boat with square ends / From Wikipedia, the free encyclopedia
A flatboat is a rectangular flat-bottomed boat with [notes 1][1] square ends used to transport freight and passengers on inland waterways. The flatboat could be any size, but essentially it is large, sturdy tub with a hull.
A flatboat is almost always a one-way vessel, and is usually dismantled for lumber when it reaches its downstream destination.[notes 2]