Salar de Alconcha, Salt flat beach near Alconcha Mountain, Antofagasta Region, Chile

Salar de Alconcha is a salt lake located at high altitude in the Antofagasta Region. The body of water is fed by underground springs and surrounded by white salt deposits.

Luis Risopatrón described the Salar de Alconcha in his Diccionario Jeográfico de Chile of 1924, placing it at 21°03' S, 68°31' W, at the eastern foot of the cerro of the same name. He called it of medium extent. The work cites earlier sources numbered 116, 134 and 156.

The name Alconcha comes from the cerro of the same name at whose eastern foot the salt flat lies, as recorded by Luis Risopatrón in his 1924 Diccionario Jeográfico de Chile. The flat has no economic exploitation of its brines; its only visible water supply is the large bofedal on the southwest shore, with flowing and diffuse springs and numerous evaporation pools.

The salt flat sits at 4,250 m, where the average temperature is 3.5 °C and annual rainfall reaches about 200 mm. The only visible water feeding the lagoon comes from the southwest shore, a large bog with flowing and diffuse springs and numerous evaporation pools. Approach from the Michincha salt flat to the east or from the headwaters of the Loa to the south.

The only visible inflow to the lagoon is the large bofedal on the southwest shore, with flowing and diffuse springs and numerous evaporation pools. The eastern shore's underground inflow is only probable, according to one study.