Tahiti is the largest island in French Polynesia, the South Pacific archipelago. Shaped like a figure-8, it's divided into Tahiti Nui (the larger, western section) and Tahiti Iti (the eastern peninsula). With black-sand beaches, lagoons, waterfalls and 2 extinct volcanoes, it's a popular vacation destination. Explored by Captain James Cook in the 18th century, it was also often painted by French artist Paul Gauguin.