Londonderry Island () is an island (UFI -889706) in the

Magallanes Region The Magallanes Region (), officially the Magallanes y la Antártica Chilena Region ( es, Región de Magallanes y de la Antártica Chilena), is one of Chile's 16 first order administrative divisions. It is the southernmost, largest, and second lea ...

at the western end of the

Beagle Channel Beagle Channel (; Yahgan: ''Onašaga'') is a strait in the Tierra del Fuego Archipelago, on the extreme southern tip of South America between Chile and Argentina. The channel separates the larger main island of Isla Grande de Tierra del Fuego fr ...

and

Darwin Sound The Darwin Sound is an expanse of seawater which forms a westward continuation of the Beagle Channel and links it to the Pacific Ocean at Londonderry Island and Stewart Island, not far from the southern tip of South America. It thus forms a naviga ...

. The island was named by the captain of

HMS Beagle HMS ''Beagle'' was a 10-gun brig-sloop of the Royal Navy, one of more than 100 ships of this class. The vessel, constructed at a cost of £7,803 (roughly equivalent to £ in 2018), was launched on 11 May 1820 from the Woolwich Dockyard on th ...

Robert FitzRoy Vice-Admiral Robert FitzRoy (5 July 1805 – 30 April 1865) was an English officer of the Royal Navy and a scientist. He achieved lasting fame as the captain of during Charles Darwin's famous voyage, FitzRoy's second expedition to Tierra de ...

, whose maternal grandfather was The 1st Marquess of Londonderry, an

Ulster-Scots Ulster Scots, may refer to: * Ulster Scots people The Ulster Scots ( Ulster-Scots: ''Ulstèr-Scotch''; ga, Albanaigh Ultach), also called Ulster Scots people (''Ulstèr-Scotch fowk'') or (in North America) Scotch-Irish (''Scotch-Airisch'') ...

peer. The island is very irregularly shaped. It lies between Fitzroy Bay to the west and

Bahía Cook Bahía Cook, also known in English as Cook Bay, is an irregular bay located between Londonderry Island, Hoste Island, ''Olga Island'' and Gordon Island southwest of Tierra del Fuego in Chile. The bay forms an entrance to the Beagle Channel, th ...

to the east, and between the

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...

to the south and the

Ballenero Channel The Ballenero Channel (Spanish: ''Canal Ballenero'') runs between the Tierra del Fuego and Cook, Londonderry and the Stewart Islands and joints the ''Pomar Channel'' (north of O'Brien Island) and ''O'Brien Channel'' (south of the O'Brien Island) ...

and O'Brien Channel to the north. Nearby islands include Gilbert Island and Stewart Island to the northwest,

O'Brien Island, Chile OBrien Island ({{Lang-es, Isla O'Brien) is located at the western end of the Beagle Channel. 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 ...

to the north, and Cook Island (or London Island) and Thompson Island to the east. Londonderry Island and smaller nearby islands form an archipelago (UFI -889707) known as the Londonderry Islands ().

References

Islands of Tierra del Fuego {{MagellanAntarctic-geo-stub