Mitre Peninsula is the easternmost part of Isla Grande de Tierra del Fuego, located in the very southeast of the island, with its easternmost point, Cabo San Diego, 29 km northwest of Isla de los Estados, from which it is separated by Le Maire Strait. In the south, the peninsula is bounded by the Beagle Channel, and in the north by the Argentine Sea. It is under 4000 km² in area. The highest peak is Cerro Campana in the southern Montes Negros range with 1026 meters.