Las Lajas is a town in Neuquén Province, Argentina, and the capital of Picunches Department. The town, at an altitude of 900 metres (3,000 ft) above mean sea level, is located on the right shore of Agrio River at the Andean foothills. National Routes 22 and 40 intersect in this area of the central Neuquén Province. The Cuchillo Curá range, considered the most important underground ecosystem in Argentina, extends approximately 10 kilometres (6.2 mi) from Las Lajas.