Tierra del Fuego. Tierra del Fuego is an archipelago off the southernmost tip of the South American mainland, across the Strait of Magellan. The archipelago consists of the main island, Isla Grande de Tierra del Fuego, with an area of 48,100 km 2, and a group of many islands, including Cape Horn and Diego Ramírez Islands. Tierra del Fuego is divided between Chile and Argentina, with the latter controlling the eastern half of the main island and the former the western half plus the islands south of Beagle Channel. The earliest known human settlement in Tierra del Fuego dates to around 8000 BCE. Europeans first explored the islands during Ferdinand Magellan's expedition of 1520; Tierra del Fuego and similar namings stem from sightings of the many bonfires that the natives built. Settlement by those of European descent and the great displacement of the native populations did not begin until the second half of the 19th century, at the height of the Patagonian sheep farming boom and of the local gold rush. Today, petroleum extraction dominates economic activity in the north of Tierra del Fuego, while tourism, manufacturing, and Antarctic logistics are important in the south. The earliest human settlement occurred around 8000 BCE. The Yaghan were some of the earliest known humans to settle in Tierra del Fuego. Archeological sites with characteristics of their culture have been found at locations such as Navarino Island. The name Tierra del Fuego was given by the Portuguese explorer Ferdinand Magellan while sailing for the Spanish Crown in 1520; he was the first European to visit these lands. He believed he was seeing the many fires of the Yaghan, which were visible from the sea, and that the Indians were waiting in the forests to ambush his armada. In 1525 Francisco de Hoces was the first to speculate that Tierra del Fuego was one or more islands rather than part of what was then called Terra Australis. Francis Drake in 1578 and a Dutch East India Company expedition in 1616 learned more about the geography. The latter expedition named Cape Horn. On his first voyage with HMS Beagle in 1830, Robert FitzRoy picked up four native Fuegians, including Jemmy Button and brought them to England. The surviving three were taken to London to meet the King and Queen and were, for a time, celebrities. They returned to Tierra del Fuego in Beagle with FitzRoy and Charles Darwin, who made extensive notes about his visit to the islands During the second half of the 19th century, the archipelago began to come under Chilean and Argentine influence. Both countries sought to claim the whole archipelago based on de jure Spanish colonial titles. Salesian Catholic missions were established in Río Grande and Dawson Island. Anglican missions were established by British colonists at Keppel Island in the Falklands in 1855 and in 1870 at Ushuaia on the main island, which continued to operate through the 19th century. Thomas Bridges learned the language and compiled a 30,000-word Yaghan grammar and dictionary while he worked at Ushuaia. It was published in the 20th century and considered an important ethnological work. An 1879 Chilean expedition led by Ramón Serrano Montaner reported large amounts of placer gold in the streams and river beds of Tierra del Fuego. This prompted massive immigration to the main island between 1883 and 1909. Numerous Argentines, Chileans and Croatians settled in the main island, leading to increased conflicts with native Selk'nam.