Tolhuin is a town situated in the province of Tierra del Fuego within Argentina. It occupies a specific geographic position on the eastern shore of Lake Fagnano, located in the southern part of the Isla Grande de Tierra del Fuego. This placement defines its regional identity as a settlement nestled between significant natural and urban landmarks in the far south of the country.

The town was officially founded on October 9, 1972, establishing its modern administrative history. The name Tolhuin derives from the Selkʼnam language, where it translates to mean like a heart. This etymological origin provides a cultural link to the indigenous heritage of the region, marking the settlement's linguistic roots alongside its relatively recent establishment in the twentieth century.

Geographically, Tolhuin lies directly on National Route 3, serving as a critical waypoint for travelers. It holds the distinction of being the only town between the cities of Ushuaia to the south and Río Grande to the north along this motorway. This unique position makes it a central hub for transit, physically separating the two larger urban centers while connecting them through the national road network.

A notable landmark within the town center is Panadería La Unión, a bakery that has gained regional fame. Most buses traveling to Ushuaia stop here, allowing passengers to enjoy coffee and baked goods. The establishment's walls are lined with autographed photographs of Argentine celebrities who have visited over the decades, creating a unique cultural archive that attracts visitors seeking local culinary experiences.

According to the 2022 census, Tolhuin has 9,879 inhabitants, making it the third largest settlement on the Argentine side of Tierra del Fuego after Ushuaia and Río Grande. The climate is classified as tundra, bordering closely on subpolar oceanic and subantarctic continental types. Its location is approximately 103 kilometres from Ushuaia and 133 kilometres from Río Grande.