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A raft is any flat structure for support or transportation over water or a vehicle that is made of floatable objects that is not propelled by a engine and can consist of a flat bottom or pontoon shape. It is the most basic of boat design, characterized by the absence of a hull. Although there are cross-over boat types that blur this definition, rafts are usually kept afloat by using any combination of buoyant materials such as wood, sealed barrels, or inflated air chambers.