O'Brien Island (Spanish: Isla O'Brien) is located at the western end of the Beagle Channel.

O'Brien Island
O'Brien Island is located in Chile
O'Brien Island
O'Brien Island
Coordinates54°52′49″S 70°33′28″W / 54.880213°S 70.557783°W / -54.880213; -70.557783Coordinates: 54°52′49″S 70°33′28″W / 54.880213°S 70.557783°W / -54.880213; -70.557783
Area136.3 km2 (52.6 sq mi)
Coastline68.7 km (42.69 mi)
Highest elevation701 m (2,300 ft)
RegionMagallanes y la Antártica Chilena Region
CommuneCabo de Hornos

East of the island is the Paso Darwin, that is the beginning of the Beagle Channel. To the north is the Isla Grande de Tierra del Fuego, separated by the Pomar Channel. To the South is the Guillermo Island and the Londonderry Island separated by the O'Brien Channel.

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