Beagle Channel in the context of "Picton, Lennox and Nueva"

Patagonia (Spanish pronunciation: [pataˈɣonja]) is a geographical region in southern South America that spans parts of Argentina and Chile. It includes the southern portion of the Andes mountain range, featuring lakes, fjords, temperate rainforests, and glaciers in the west, and deserts, tablelands, and steppes toward the east. The region is bounded by the Pacific Ocean to the west, the Atlantic Ocean to the east, and several waterways that connect them, including the Strait of Magellan, the Beagle Channel, and the Drake Passage to the south.

The northern limit of the region is not precisely defined; the Colorado and Barrancas rivers, which run from the Andes to the Atlantic, are commonly considered the northern limit of Argentine Patagonia; on this basis the extent of Patagonia could be defined as the provinces of Neuquén, Río Negro, Chubut and Santa Cruz, together with Patagones Partido in the far south of Buenos Aires Province. The archipelago of Tierra del Fuego is sometimes considered part of Patagonia. Most geographers and historians locate the northern limit of Chilean Patagonia at Huincul Fault, in Araucanía Region.

Puerto Williams (Spanish: [ˈpweɾto ˈ(ɣ)wiljams]; Spanish for "Port Williams") is a city, port and naval base on Navarino Island in Chile. It faces the Beagle Channel. It is the capital of the Chilean Antarctic Province, one of four provinces in the Magellan and Chilean Antarctica Region, is the main city inside the Cape Horn Biosphere Reserve, and administers the communes of Chilean Antarctic Territory and Cabo de Hornos. It has a population of 2,874, including both naval personnel and civilians. Puerto Williams claims the title of world's southernmost city.The settlement was founded in 1953, and was first named Puerto Luisa. The town was later named after John Williams Wilson, a British man who founded Fuerte Bulnes, the first settlement in the Strait of Magellan. It has served primarily as a naval base for Chile. The Chilean Navy runs the Guardiamarina Zañartu Airport and hospital, as well as nearby meteorological stations. Since the late 20th century, the number of navy personnel has decreased in Puerto Williams and the civilian population has increased. In that period, tourism and support of scientific research have contributed to an increase in economic activity.

The port attracts tourists going to Cape Horn or Antarctica; its tourism industry developed around the concept of "the world's southernmost city". Based on some definitions of what constitutes a city, Puerto Williams could in fact be the southernmost city in the world. However, others dispute this because of the small settlement size and population in favor of Ushuaia or Punta Arenas. Chilean and Argentine media, a bilateral agreement between Chile and Argentina, and the Puerto Williams administration identify it as the southernmost city in the world.

Ushuaia (/uːˈswaɪ.ə/ oo-SWY-ə, Spanish: [uˈswaja]) is the capital of Tierra del Fuego, Antártida e Islas del Atlántico Sur Province, Argentina. With a population of 82,615 and a location below the 54th parallel south latitude, Ushuaia claims the title of world's southernmost city.

Ushuaia is located in a wide bay on the southern coast of Isla Grande de Tierra del Fuego. It is bounded on the north by the Martial mountain range and on the south by the Beagle Channel. It is the only municipality in the Department of Ushuaia and has an area of 9,390 km (3,625 sq mi). It was founded on 12 October 1884 by Augusto Lasserre and is located on the shores of the Beagle Channel surrounded by the mountain range of the Martial Glacier, in the Bay of Ushuaia. In addition to being an administrative center, it is a light industrial port and tourist destination. Ushuaia is located roughly 1,100 kilometres (680 mi) from the Antarctic Peninsula and is one of five internationally recognized Antarctic gateway cities; it is one of two South American cities with that status along with Chile's Punta Arenas.

Hoste Island (Spanish: Isla Hoste) is one of the southernmost islands in Chile, lying south, across the Beagle Channel, from Isla Grande de Tierra del Fuego and west of Navarino Island, from which it is separated by the Murray Channel. It is named after William Hoste, one of Lord Nelson's protégés.

Londonderry Island (Spanish: Isla Londonderry) is an island (UFI -889706) in the Magallanes Region at the western end of the Beagle Channel and Darwin Sound. The island was named by the captain of HMS Beagle, Robert FitzRoy, whose maternal grandfather was The 1st Marquess of Londonderry, an Ulster-Scots peer.

The island is very irregularly shaped. It lies between Fitzroy Bay to the west and Bahía Cook to the east, and between the Pacific Ocean to the south and the Ballenero Channel and O'Brien Channel to the north. Nearby islands include Gilbert Island and Stewart Island to the northwest, O'Brien Island, Chile to the north, and Cook Island (or London Island) and Thompson Island to the east.