Crab claw sail in the context of "Marshall Islands"

The Austronesian people, sometimes referred to as Austronesian-speaking peoples, are a large group of peoples who have settled in Taiwan, maritime Southeast Asia, parts of mainland Southeast Asia, Micronesia, coastal New Guinea, Island Melanesia, Polynesia, and Madagascar that speak Austronesian languages. They also include indigenous ethnic minorities in Vietnam, Cambodia, Myanmar, Thailand, Hainan, the Comoros, and the Torres Strait Islands. The nations and territories predominantly populated by Austronesian-speaking peoples are sometimes known collectively as Austronesia.

The group originated from a prehistoric seaborne migration, known as the Austronesian expansion, from Taiwan, circa 3000 to 1500 BCE. Austronesians reached the Batanes Islands in the northernmost Philippines by around 2200 BCE. They used sails some time before 2000 BCE. In conjunction with their use of other maritime technologies (notably catamarans, outrigger boats, lashed-lug boats, and the crab claw sail), this enabled phases of rapid dispersal into the islands of the Indo-Pacific, culminating in the settlement of New Zealand c. 1250 CE. During the initial part of the migrations, they encountered and assimilated (or were assimilated by) the Paleolithic populations that had migrated earlier into Maritime Southeast Asia and New Guinea. They reached as far as Easter Island to the east, Madagascar to the west, and New Zealand to the south. At the furthest extent, they might have also reached the Americas.

Austronesian vessels are the traditional seafaring vessels of the Austronesian peoples of Taiwan, Maritime Southeast Asia, Micronesia, coastal New Guinea, Island Melanesia, Polynesia, and Madagascar. They also include indigenous ethnic minorities in Vietnam, Cambodia, Myanmar, Thailand, Hainan, the Comoros, and the Torres Strait Islands.

They range from small dugout canoes to large lashed-lug plank-built vessels. Their hull configurations include monohulls as well as catamarans and outrigger boats (single-outrigger boats and trimarans). Traditional sail types include a variety of distinctively Austronesian crab-claw and tanja configurations, though modern vessels are typically motorized. These vessels allowed the migrations of the Austronesian peoples during the Austronesian expansion (starting at around 3000 to 1500 BC from Taiwan and Island Southeast Asia) throughout the islands of the Indo-Pacific, reaching as far as Madagascar, New Zealand, and Easter Island. They were also used to establish trading routes, including the Austronesian maritime trade network which formed the maritime leg of the spice trade and later, the maritime silk road.

Outrigger boats are various watercraft featuring one or more lateral support floats known as outriggers, which are fastened to one or both sides of the main hull. They can range from small dugout canoes to large plank-built vessels. Outrigger boats can also vary in their configuration, from the ancestral double-hull configuration (catamarans), to single-outrigger vessels prevalent in the Pacific Islands and Madagascar, to the double-outrigger vessels (trimarans) prevalent in Island Southeast Asia. They are traditionally fitted with Austronesian sails, like the crab claw sails and tanja sails, but in modern times are often fitted with petrol engines.

Unlike a single-hulled vessel, an outrigger or double-hull vessel generates stability as a result of the distance between its hulls rather than due to the shape of each individual hull. As such, the hulls of outrigger or double-hull boats are typically longer, narrower and more hydrodynamically efficient than those of single-hull vessels. Compared to other types of canoes, smaller outrigger canoes can be quite fast, yet are also capable of being paddled and sailed in rougher water. This paddling technique, however, differs greatly from kayaking or rowing. The paddle, or blade, used by the paddler is single sided, with either a straight or a double-bend shaft.

A fore-and-aft rig is a sailing ship rig with sails set mainly in the median plane of the keel, rather than perpendicular to it, as on a square-rigged vessel.