flat-bottomed boat, built mainly for river, canal transport of heavy goods, usually pushed by tugboats

A barge is a boat with a flat bottom, mostly built to transport heavy goods along rivers and canals. Some barges cannot move on their own, and must be pushed or pulled by towboats or by horses on the towpath. A narrow barge may be called a narrowboat.

Barge carrying recycling material on Deûle channel in Lambersart, France