Palmyra Atoll /pælˈmaɪrə/ is an essentially unoccupied equatorial Northern Pacific atoll administered as an unorganized incorporated territory by the United States federal government. The variable temporary population of 4–20 'non-occupants' are essentially staff and scientists employed by various departments of the U.S. federal government and The Nature Conservancy, as well as a rotating mix of Palmyra Atoll Research Consortium scholars pursuing research.
Palmyra is one of the Northern Line Islands (southeast of Kingman Reef and north of Kiribati Line Islands), located almost due south of the Hawaiian Islands, roughly halfway between Hawaii and American Samoa. The atoll is 4.6 sq mi (12 km2), and it is located in the equatorial Northern Pacific Ocean. Its 9 mi (14 km) of coastline has one anchorage known as West Lagoon.
The atoll consists of an extensive reef, two shallow lagoons, and some 50 sand and reef-rock islets and bars covered with vegetation—mostly coconut trees, Scaevola, and tall Pisonia trees. The islets of the atoll are all connected, except Sand Island and the two Home Islets in the west and Barren Island in the east. Average annual rainfall is approximately 175 in (4,400 mm) per year. Daytime temperatures average 85 °F (29 °C) year round.