Brunswick Peninsula is a large peninsula in Magallanes y la Antártica Region

Magallanes y la Antártica Chilena Region

The XII Magallanes and Antártica Chilena Region is one of Chile's 15 first order administrative divisions...

, Patagonia

Patagonia

Patagonia is a region located in Argentina and Chile, integrating the southernmost section of the Andes mountains to the southwest towards the Pacific ocean and from the east of the cordillera to the valleys it follows south through Colorado River towards Carmen de Patagones in the Atlantic Ocean...

, Chile

Chile

Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...

, at 53.5°S 71.4166667°W. It is 16 kilometres (9.9 mi) wide at its base in the north, and almost 80 kilometres (49.7 mi) in the south. It measures 115 kilometres (71.5 mi) in length from the base to Cape Froward

Cape Froward

Cape Froward is the southernmost point on the mainland of South America. It is located in the North shores of Magellan Strait, being the southern tip of the Brunswick Peninsula; in Chilean territory....

, the southernmost point of the American mainland. This yields an area of more than 6300 sqkm.

The only city in the Peninsula is Punta Arenas, the regional capital. While the settled part of Punta Arenas is located at the east coast, all of the peninsula is part of the commune (municipality) of Punta Arenas, plus some large, and many small, mostly uninhabited nearshore islands like Isla Capitán Aracena

Aracena Island

Aracena Island is an island in the Patagonian Archipelago, Magallanes y la Antártica Chilena Region, Chile. It belongs to the Tierra del Fuego archipelago. It has an area of . The highest point of the island is Monte Vernal at...

, Clarence Island (south) and Dawson Island

Dawson Island

Dawson Island is an island in the Strait of Magellan that forms part of the Tierra del Fuego archipelago, 100 km south of the city of Punta Arenas in Chile, and part of the Municipality of Punta Arenas. It is located southeast of Brunswick Peninsula and is an approximately 1290 km² tract...

 (southeast). In the northwest, the peninsula borders the commune of Laguna Blanca

Laguna Blanca, Chile

Laguna Blanca is Chilean commune located in Magallanes Province and Region. The commune is administered by the municipality in Villa Tehuelches, that is the major settlement in the whole commune.-Demographics:...

, and in the northeast, San Gregorio

San Gregorio, Chile

San Gregorio is Chilean town and commune located in northeast coast of the Strait of Magellan and is part of Magallanes Province and Region. The commune is administered by the municipality in Punta Delgada, the principal settlement. At the site of Primera Angostura, located within the commune, a...

.