Tierra del Fuego is bounded on the east by the South Atlantic, on the north by the Magellan Straits and on the south and west by a series of fjords and channels linked to the Pacific Ocean.
The southwest part of the island, between the Almirantazgo Fjord and the Beagle Channel and extending west to end at Brecknock Peninsula on the Pacific Ocean, is mountainous with a heavily indented coastline, dominated by the Cordillera Darwin.