Teraina (Washington Island)

Teraina is a small atoll in the northern Line Islands, approximately 225 kilometres north of the equator, but what it lacks in size it makes up for in ecological distinctiveness. The island contains a genuine freshwater lake at its centre, a feature found on almost no other Pacific atoll and one that transforms the island's interior into a lush environment of coconut palms, pandanus and tropical hardwoods entirely unlike the scrubby vegetation that characterises most Kiribati atolls. The lake, known locally as the Teraina swamp or lagoon, supports a distinct ecosystem including the island's own variety of freshwater fish and invertebrates, and the surrounding vegetation grows with a density and height that seems incongruous with the surrounding ocean. The effect from above is startling: a disc of vivid green surrounded by the white beaches and turquoise lagoon waters of the atoll rim, with the dark green of the interior canopy visible through the palm crowns.

The island's isolation and the presence of the freshwater lake have produced a distinctive terrestrial ecology. Coconut crabs are particularly abundant here, their large individuals commonly seen moving across the forest floor at night or congregating near the base of coconut palms where they can access fallen fruit. The crabs are a traditional food source for the island's small population and are protected by local custom from over-collection, a governance system that has maintained healthy populations here when they have been depleted on many other Pacific islands. The indigenous bird fauna includes the Teraina form of the Kiribati kingfisher, which has adapted to the freshwater lake environment in a way that has not occurred on drier atolls.

The human settlement on Teraina is small and focused on the village of Washington, named for the American guano trader who claimed the island for the United States in the nineteenth century under the Guano Islands Act, a historical claim that was later transferred to Kiribati sovereignty. The village is compact and traditionally organised around the maneaba (meeting house), with houses set back from the beach among the coconut trees. Access to the island is difficult: there is no airstrip and the island is reached by a small boat crossing from Kiritimati to the south, a journey that is weather-dependent and can take six hours or more in rough conditions. This difficulty has largely preserved the island from the outside influences that have affected more accessible parts of Kiribati, and traditional social structures and resource management practices remain strong.

The freshwater lake at the island's interior is the subject of ongoing scientific interest, as raised coral atolls rarely if ever support genuine freshwater lenses due to their low elevation and porous limestone substrate. Teraina's lake appears to be maintained by a combination of high rainfall and the island's relatively northern position in a zone of more consistent precipitation, combined with organic material accumulation at the island's centre that retards drainage through the limestone. Visitors are typically welcome to swim in the lake with local guidance.

One of very few Pacific atolls with a genuine freshwater lake at its centre, creating a unique inland ecosystem.

Abundant coconut crab population maintained by traditional conservation practices unusual in the Pacific.

Distinctive birdlife including the Teraina-adapted form of the Kiribati kingfisher.

Remote and largely uninfluenced by modern tourism, with traditional social structures and governance through the maneaba.