Kiriwina Islands

The Trobriand Islands are a 450-square-kilometre (174-square-mile) archipelago of coral atolls off the east coast of New Guinea. They are part of the nation of Papua New Guinea and are in Milne Bay Province. Most of the population of 12,000 indigenous inhabitants live on the main island of Kiriwina, which is also the location of the government station, Losuia. Other major islands in the group are Kaileuna, Vakuta, and Kitava. The group is considered to be an important tropical rainforest ecoregion in need of conservation.

The Trobriands consist of four main islands, the largest being Kiriwina Island, and the others being Kaileuna, Vakuta and Kitava. Kiriwina is 43 kilometres (27 miles) long, and varies in width from 1 to 16 kilometres (0.62 to 9.94 mi). In the 1980s, there were around sixty villages on the island, containing around 12,000 people, while the other islands were restricted to a population of hundreds. Other than some elevation on Kiriwina, the islands are flat coral atolls and "remain hot and humid throughout the year, with frequent rainfall."

The people of the area are mostly subsistence horticulturalists who live in traditional settlements. The social structure is based on matrilineal clans that control land and resources. People participate in the regional circuit of exchange of shells called kula, sailing to visit trade partners on seagoing canoes. In the late twentieth century, anti-colonial and cultural autonomy movements gained followers from the Trobriand societies. When inter-group warfare was forbidden by colonial rulers, the islanders developed a unique, aggressive form of cricket.

Although an understanding of reproduction and modern medicine is widespread in Trobriand society, their traditional beliefs have been remarkably resilient. For example, the real cause of pregnancy is believed to be a baloma, or ancestral spirit, that enters the body of a woman, and without whose existence a woman could not become pregnant; all babies are made or come into existence (ibubulisi) in Tuma. These tenets form the main stratum of what can be termed popular or universal belief. In the past, many held this traditional belief because the yam, a major food of the island, included chemicals (phytoestrogens and plant sterols) whose effects are contraceptive, so the practical link between sex and pregnancy was not very evident.

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