The Chonos Archipelago is a series of low, mountainous, elongated islands with deep bays, traces of a submerged Chilean Coast Range.

Chonos Archipelago was mapped in the 18th and 19th centuries by José de Moraleda y Montero (1793), Robert FitzRoy (1834) and Enrique Simpson (1870–71).

[1][2] Most of the archipelago is covered by a more-less open Pilgerodendron forest with cushion plants such as Astelia pumila, Donatia fascicularis and Oreobolus obtusangulus.

[3] In the western fringes of the archipelago a shrubland of c. 2 meter high Pilgerondendron and Nothofagus nitida grows.

Amidst this shrubland, occasional peatlands and forests exist.