Almirantazgo Fjord (Spanish: Fiordo Almirantazgo), also known as Almirantazgo Sound (Spanish: Seno Almirantazgo) or Admiralty Sound, is a Chilean fjord located in the far south of the country at . The fjord cuts deeply into the west coast of the Isla Grande de Tierra del Fuego, extending southeastwards from the Whiteside Channel, which separates Isla Grande from Dawson Island. On its south side several smaller fjords and bays make significant indentations into the north coastline of the Cordillera Darwin. One of these, Ainsworth Bay, is home to a colony of elephant seals. Azopardo River empties into the head of the fjord.
Ainsworth Bay, fed by the meltwater of Marinelli Glacier is a notable inlet along the Almirantazgo Fjord. The Marinelli Glacier has been in a state of retreat since at least 1960, and the retreat continues to the present time of 2008.
- Earth Info, earth-info.nga.mil webpage: "Archived copy". Archived from the original on 2012-05-04. Retrieved 2012-05-05..
- USGS. "Tierra del Fuego map". Retrieved 2007-10-05.
- (in Spanish) Proyecto Gef marino en Chile - AMCP-MU
- Murray, Hugh (1834). An Encyclopaedia of Geography. p. 1433.
- C. Michael Hogan. 2008 Bahia Wulaia Dome Middens, Megalithic Portal, ed. Andy Burnham
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