National Geographic Orion arrived at the southern end of Fakarava Atoll around midmorning. Fakarava Atoll lies in the western region of the Tuamotu Archipelago and is the second largest atoll in French Polynesia, after Rangiroa. Fakarava Atoll is the rough shape of a rectangle and has a length of about 60 km (37 mi) and a width of 21 km (13 mi). This includes a wide and deep internal lagoon with a surface area of 1,112 km2 (412 mi2), compared to a narrow surrounding band of islets with a total land area of only 16 km2 (6 mi2). The islets, typical for a coral atoll, barely rise above sea level and are densely covered with lush, green vegetation.