This large island extends into the continental coast, from which it is divided by the channels just mentioned.

In its central part the extinct volcano Montalat rises to a height of 5,446 feet.

the west coast of the island is Pangal Inlet, which is of no use to navigation.

Five miles farther north of this is Senec Island, low and sloping, forming a good day mark, which should be left to the eastward in passing.

The fishing community and hamlet of Puerto Gaviota is located in the southwestern part of the island at the meeting point of Puyuhuapi Channel with Moraleda Channel.