They lie off Dunnose Head, West Falkland, at the mouth of King George Bay.

Past overgrazing has caused erosion and reduced the cover of tussac.

Third and Fourth Passage Islands are 800 m apart and low lying, rising to about 30 metres (98 ft).

[1] The Passage Islands group has been identified by BirdLife International as an Important Bird Area (IBA).

Birds for which the site is of conservation significance include Falkland steamer ducks, gentoo penguins (300 breeding pairs), southern rockhopper penguins (145 pairs), southern giant petrels, striated caracaras, white-bridled finches, blackish cinclodes and Cobb's wrens.