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Ofu-Olosega
Ofu-Olosega from Space Shuttle.
Elevation	639 m (2,096 feet)
Location	American Samoa
Prominence	639 m
Coordinates	14.175° S 169.618° W
Topo map	USGS
Type	Shield volcanos
Last eruption	1866

Ofu and Olosega are parts of a volcanic doublet in the Manu‘a Group of the Samoa Archipelago—part of American Samoa. Although geographically separate volcanic remnants, only a narrow straight (Asaga) naturally bridged by a shallow coral reef separates them. Before 1970, one had to wade between the two islands at low tide; now a road bridge over the straight connects villages on Ofu with those on Olosega.

Ofu is the western part of the volcanic outcrop of Ofu-Olosega Island. The main village of Ofu is located on the western shore, protected behind an offshore islet (eroded tuff cone) known as Nu‘utele. Ofu has a small airport and a boat harbor that serve the population on Ofu and Olosega.

South shore of Ofu seen from Olosega across the narrow straight that separates them. The sharp peak, an eroding dike complex, is named Sunu‘itao.

Most of the southern shore and associated coral reef are part of the National Park of American Samoa. The U.S. National Park Service is presently (2005) negotiating with village councils on Olosega to expand the park around that island.

The island forms the Ofu County subdivision of the Manua District. It has a land area of 7.215 km² (2.786 sq mi), and had an official population of 289 persons as of the 2000 census.

Olosega Island is a remnant of the Sili shield volcano, the caldera of which may lie submerged off the north shore. The undersea eruption of 1866 was actually 3 km east of Olosega, on a submarine ridge that extends eastsoutheast to nearby Ta‘ū.

The island forms the Olosega County subdivision of the Manua District. It has a land area of 5.163 km² (1.993 sq mi), and had an official population of 216 persons as of the 2000 census.

There are two villages on Olosega: Olosega and Sili. Sili now consists of but one standing residence after much of the village was destroyed by hurricanes (and subsequently abandoned). Nearly all of the population of Olosega now resides in Olosega village along the southwestern-facing shore.

• Office of the Governor. 2004. Manu‘a ma Amerika. A brief historical documentary. Manu‘a Centennial. 16 July 1904. 16 July 2004. Office of the Governor, American Samoa Government. 20 p.
• Siebert L, Simkin T (2002-). Volcanoes of the World: an Illustrated Catalog of Holocene Volcanoes and their Eruptions. Smithsonian Institution, Global Volcanism Program Digital Information Series, GVP-3, (http://www.volcano.si.edu/world/). (Website difficult to use)
• Ofu County and Olosega County, Manu'a District, United States Census Bureau

• National Park Service map of the Manu‘a Islands
• Persistence of Coral Reefs Under Extreme Environmental Stress in American Samoa G. Piniak, C. Birkeland, and G. Garrison (2004). University of Hawaii.

	Territory of American Samoa Pago Pago (capital), Fagatogo (seat of government)
Topics	Geography | Economy | Demographics | Communications | Transportation
Government	Politics | Former Governors | Elections | Current Governor
Villages	Fagatogo | Leone | Nu'uuli | Tāfuna | Utulei
Islands	Tutuila | Aunu'up | Manua Group (Ta'ū | Ofu‑Olosega | Rose Atoll | Swains Island)