It has a land area of 3.03 square kilometres (1.17 sq mi) and is about 4.0 miles (6.4 km) long in a north-west to south-east direction.

[1] Hummock Island is off the western coast of West Falkland, in a bay that leads to the estuary of the Chartres River.

However, the present owner has indicated that he will not restock the island but will allow the vegetation to recover.

The Hummock Island group has been identified by BirdLife International as an Important Bird Area (IBA).

Birds for which the site is of conservation significance include southern rockhopper penguins (1700 breeding pairs), imperial shags, striated caracaras (8–10 pairs), and Cobb's wrens.