A raft is any flat floating structure for travel over water. It is the most basic of
boat design, characterized by the absence of a
hull. Instead, rafts are kept afloat using any combination of buoyant materials such as
wood, sealed barrels, or inflated air chambers. Traditional or primitive rafts are constructed of wood or
reeds. Modern rafts may also use
pontoons,
drums, or
extruded polystyrene blocks. Inflatable rafts use durable, multi-layered rubberized fabrics. Depending on its use and size, it may have a
superstructure, masts, or rudders.
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