Estany de Mascarida is a lake of glacial origin that is located at an altitude of 2319m, at the head of the Vall de Cardós, in the Pallars Sobirà, to the NW. of the town of Tavascan, in the municipal term of Lladorre.
Its basin is located between the Pic de la Coma del Forn (2683m), to the NW, Campirme (2633m) to the S., and the Montforcado (2634m) to the W.
It has an area of 2.04 hectares and a length of 205m. receives the waters of the Devil's Lake by the O. and the Estanys de Mascarida de Dalt to the NW. The discharge of its waters forms the Torrent of Mascarida.
In its waters we can find the Pyrenean newt (Calotriton asper) which is an endemic species of the Pyrenees.
It is under the protection of the Alt Pirineu Natural Park.