Toltén River in the context of Villarrica, Chile

Araucanía or Araucana was the Spanish name given to the region of Chile inhabited by the Mapuche peoples known as the Moluche (also known as Araucanos by the Spanish) in the 18th century. Prior to the Spanish conquest of Chile, the lands of the Moluche lay between the Itata River and Toltén River.

La Frontera in Chile is the region around the Bío Bío River, or the whole area between it and the Toltén River. The use of this latter definition is largely coterminous with the historical usage of Araucanía. The term was coined during the period when the region was the frontier of the Captaincy General of Chile, then a part of the Spanish Empire and later the Republic of Chile, with the Mapuche people inhabiting the Araucanía following their revolt in 1598. Subsequently, the Spanish Empire established a system of forts between the Bío Bío River and the Itata River, as well as some within the Araucanía. This system continued through the 18th century and into the 19th century.

The Picunche (a Mapudungun word meaning "North People"), also referred to as picones by the Spanish, were a Mapudungun-speaking people living to the north of the Mapuches or Araucanians (a name given to those Mapuche living between the Itata and Toltén rivers) and south of the Choapa River and the Diaguitas. Until the Conquest of Chile the Itata was the natural limit between the Mapuche, located to the south, and Picunche, to the north. During the Inca attempt to conquer Chile the southern Picunche peoples that successfully resisted them were later known as the Promaucaes.

The Picunche living north of the Promaucaes were called Quillotanes (those living in the Aconcagua River valley north to the Choapa) and Mapochoes (those living in the Maipo River basin) by the Spanish, and were part of the Inca Empire at the time when the first Spaniards arrived in Chile.

Villarrica National Park is located in the Andes, in the La Araucanía and Los Ríos regions of Chile, near Pucón. The centerpiece of the park is a line of three volcanoes stretching transversely to the Andean range: Villarrica, Quetrupillán, and Lanín. Other mountains in the park include Quinquilil volcano (2,050 m (6,726 ft)), also known as Colmillo del Diablo, and Cerro Las Peinetas, which lies on the border between Argentina and Chile. It ranges in elevation from 600 m (1,969 ft) to 3,776 m (12,388 ft) at Lanín Volcano.

The drainage divide between the Toltén River drainage basin and the Valdivia River basin runs through the park and marks the boundary between the Cautín Province and the Valdivia Province.

The Chilean Lake District is a zone in Southern Chile defined by its many lakes in the Andean foothills. The term is primarily used in tourism literature and advertising, in Chile Zona Sur is preferred as a geographical concept. The Chilean Lake District includes the cities of Temuco, Villarrica, Pucón, Valdivia, Osorno, Entre Lagos (Puyehue), Puerto Octay, Frutillar, Puerto Varas and Puerto Montt.

All lakes drain ultimately to the Pacific Ocean. In the north to Toltén River collects the water of Villarrica, Caburgua and Colico. South of these lakes lie the Seven Lakes whose waters reach the Pacific through Valdivia River. Bueno River drains the water of Ranco, Maihue, Puyehue and Rupanco lakes. Llanquihue Lake is drained to the Pacific by Maullín River and Petrohué River does the same for Todos los Santos Lake.