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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.