Geography & Geology
Tahiti is neatly divided into two circles connected by an isthmus: the larger and more populated Tahiti Nui (Big Tahiti) to the northwest and the smaller Tahiti Iti (Little Tahiti) to the southeast. The narrow coastal fringe of Tahiti Nui, where the vast majority of the population is concentrated, sweeps rapidly inwards and upwards to a jumble of soaring, green-clad mountain peaks.
A fringing reef encloses a narrow lagoon around much of the island, but parts of the coast, particularly along the north coast from Mahina through Papenoo to Tiarei, are unprotected.
The mountainous centre of Tahiti Nui is effectively one huge crater, with the highest peak being Mt Orohena (2241m). A number of valleys run down to the coast from the mountains, the most impressive being the wide Papenoo Valley to the north.