Antártica Chilena Province in the context of "Antártica (commune)"

The Weddell Sea is part of the Southern Ocean and contains the Weddell Gyre. Its land boundaries are defined by the bay formed from the coasts of Coats Land and the Antarctic Peninsula. The easternmost point is Cape Norvegia at Princess Martha Coast, Queen Maud Land. To the east of Cape Norvegia is the King Haakon VII Sea. Much of the southern part of the sea is covered by a permanent, massive ice shelf field, the Filchner-Ronne Ice Shelf.

The sea is contained within the two overlapping Antarctic territorial claims of Argentine Antarctica, the British Antarctic Territory, and also resides partially within the Antarctic Chilean Territory. At its widest the sea is around 2,000 kilometres (1,200 mi) across, and its area is around 2.8 million square kilometres (1.1×10^ sq mi).

Ellsworth Land is a portion of the Antarctic continent bounded on the west by Marie Byrd Land, on the north by the Bellingshausen Sea, on the northeast by the base of the Antarctic Peninsula, and on the east by the western margin of the Filchner–Ronne Ice Shelf. It extends between 103°24'W and 79°45'W. The area west of 90°W is unclaimed, the area between 84°W and 90°W is claimed by Chile only, and the remainder by Chile and the United Kingdom as a part of the British Antarctic Territory. Eights Coast stretches between 103°24'W and 89°35'W, and Bryan Coast between 89°35'W and 79°45'W.

It is largely a high ice plateau, but includes the Ellsworth Mountains and a number of scattered mountain groups: Hudson, Jones, Behrendt, Hauberg, Merrick, Sweeney and Scaife Mountains.

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.

Isla Grande de Tierra del Fuego (Spanish for 'Great Island of Land of Fire'), also formerly called Isla de Xátiva, is an island near the southern tip of South America from which it is separated by the Strait of Magellan. The western portion (61.43%) of the island (27,294 km (10,538.3 sq mi)) is in Chile (Province of Tierra del Fuego and Antártica Chilena Province), while the eastern portion (38.57%, or 20,698 km (7,991.5 sq mi)) is in Argentina (Tierra del Fuego Province). It forms the major landmass in an extended archipelago (island group) also called Tierra del Fuego.

The island has an area of 47,992 km (18,530 sq mi), making it the largest island in South America and the 29th largest island in the world. Its two biggest towns are Ushuaia and Río Grande, both in Argentina. Other towns are Tolhuin, Porvenir, Camerón, and Cerro Sombrero. The Argentine side, Tierra del Fuego Province, has 190,641 inhabitants (2022), whereas the Chilean side has only 6,656 (2012), almost all located in the Tierra del Fuego Province.

The Diego Ramírez Islands and Drake Passage National Park (formerly the Islas Diego Ramírez-Drake Passage Marine Park) is a national park of Chile established in 2018 as a marine park and redesignated as a national park in 2025. It lies south of the Tierra del Fuego archipelago, surrounding the Diego Ramírez Islands. Administratively, it belongs to Antártica Chilena Province in the Magallanes y la Antártica Chilena Region.

The park spans 14,439,060 ha and aims to conserve subantarctic oceanic ecosystems, pelagic bird habitat (including the wandering albatross Diomedea exulans and southern fulmar Fulmarus glacialoides), marine mammals, and distinctive geomorphological features such as shallow seamounts associated with the circulation of the Southern Ocean. It complements the Cape Horn Biosphere Reserve.

Picton, Lennox and Nueva (Spanish: Islas Picton, Nueva y Lennox) form a group of three islands (and their islets) at the extreme southern tip of South America, in the Chilean commune of Cabo de Hornos in Antártica Chilena Province, Magallanes and Antártica Chilena Region. Located in the Tierra del Fuego archipelago, they lie east of Navarino Island and are separated from the Argentine part of Isla Grande in the north by the Beagle Channel. They have an area of 170.4 km (Lennox), 105.4 km (Picton), 120.0 km (Nueva).

Close to the islands are the islets of Snipe, Augustus, Becasses, Luff, Jorge, Hermanos, Solitario, Gardiner, Terhalten, Sesambre and others.

Navarino Island (Spanish: Isla Navarino) is a large Chilean island, with an area of 2,514 km (971 sq mi) and a coastline of 510 km (320 mi). It is located between Isla Grande de Tierra del Fuego, to the north, and Cape Horn, to the south. The island forms part of the Commune of Cabo de Hornos, the southernmost commune in Chile and in the world, belonging to Antártica Chilena Province in the XII Region of Magallanes and Chilean Antarctica. Its population is concentrated primarily in the communal capital, Puerto Williams, and in small settlements like Puerto Navarino, Río Guanaco and Puerto Toro. The highest point of the island is Pico Navarino at 1,195 m (3,921 ft). The island is a popular destination for fly-fishers.