Prau

A proa, also seen as prau, perahu, and prahu, is a type of multihull sailboat. It is a vessel consisting of two (usually) unequal length parallel hulls. It is sailed so that one hull is kept to windward, and the other to leeward, so that it needs to "shunt" to reverse direction when tacking. The English term proa usually refers specifically to the South Pacific proa as described in the journals of the British ship HMS Centurion.

The perahu traditional outrigger boat is most numerous in the various islands of Indonesia, Malaysia, and the Philippines. These differ from the South Pacific vessels. Traditional proas superficially resemble outrigger canoes, but have a buoyant lee hull and a denser, ballasted hull to windward for stability.

To Americans, the boats of the Marianas Islands are arguably the most recognizable version.

The modern proa exists in a wide variety of forms, from the traditional archetype still common in areas described, to high-technology interpretations specifically designed for breaking speed-sailing records.

The word proa comes from perahu, the word for "boat" in Malay (paraw in similar Borneo–Philippine languages and prau in Javanese), which are similar to the Micronesian language group. Found in many configurations and forms, the proa was likely developed as a sailing vessel in Micronesia (Pacific Ocean). Variations may be found as distant as Madagascar and Sri Lanka, as far back as the first century. Such vessels go by many names, and "perahu" is a generic umbrella term for any boat smaller than a ship.

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