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Islas Ildefonso are a group of islands in Chile. The islands belong to the "comuna de Cabo de Hornos" of Antártica Chilena Province. They are located at , 96 kilometres west of Isla Hermite, part of Tierra del Fuego, and 93 km NNW of Diego Ramirez Islands.
The islands consist of nine stacks, within two groups. They extend 6 km on a northwest-southeast axis.
The land area measures about 0.2 km2. More than 50% of this comprises the large single southern stack, which is 970 m long and between 80 and 200 m wide.
The islands are steep and rocky, and covered in tussac grass.
They are inhabited by penguins: both Rockhopper Penguin and Magellanic Penguin are present. There is a large colony of Black-browed Albatross here also, with small number of Grey-headed Albatross. Imperial Shag is also a common breeding species.
Reference
- Shirihai, Hadoram (2002) A complete guide to Antarctic wildlife ISBN 951-98947-0-5
"Ildefonso Islands"