A small atoll of the Îles Sous le Vent group of the Society Islands, Tupai is situated 16 km north-northwest from Bora Bora and 45 km northeast from Maupiti.

The atoll is essentially oval in outline with a beak-like extension to the east where the reef rim extends across a submarine fault scarp. Tupai has a maximum north to south dimension of 9 km and a maximum width of 6 km across the northern sector (north is to top-left in the above image). The entire atoll has an area in the region of 38 km².

The atoll compises a broad reef rim that nearly completely encloses a shallow, sandy-bottomed, central lagoon. The rim is topped by two major landmasses, one each on the northern and southern sides, and by three smaller islets located upon the atoll's eastern side; they have a combined land area of 11 km².

image: earth sciences and image analysis laboratory, nasa johnson space center

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