Mataiva Atoll is notable in that its central lagoon includes a network of ridges (white, image center) and small basins formed from eroded coral reefs. Mataiva means “nine eyes” in Tuamotuan, an allusion to nine narrow channels on the south-central portion of the island. The atoll is sparsely populated, with only a single village, Pahua, located on either side of the only pass providing constant connection between the shallow (light blue) water of the lagoon and the deeper (dark blue) adjacent Pacific Ocean. Much of the 10-km (6-mi)-long atoll is covered with forest (greenish brown). Vanilla and copra (dried coconut) are major exports from the atoll, but tourism is becoming a larger part of the economy. Image courtesy of NASA.