Icalma Lake is a lake located in the Andes of the La Araucanía Region of Chile, close to Icalma International Pass. It is connected to the Laguna Chica de Icalma by a short stream, covering both lakes a surface total of 11.7 km². The lake drains northeastwards into the Biobío River by way of a 10-km-long river named Rukanuco.