Pantà dels Terradets, lake in Pallars Jussà, Spain

The Pantà dels Terradets is a reservoir on the Noguera Pallaresa in the Pallars Jussà, stretching between Llimiana, Gavet de la Conca and Castell de Mur. Its concrete gravity dam, 160 m long and 38 m high above the river bed, closes the Terradets gorge between the Montsec de Rúbies and the Montsec d'Ares. The water covers 330 ha and reaches the village of Cellers, the only settlement on its shore.

The dam was built in 1935 by Barcelona Traction, Light and Power Company Limited, known as La Canadenca, as the second reservoir on the Noguera Pallaresa for hydroelectric power. Its construction submerged the monastery of Sant Miquel de Cellers, founded around 1170 by the counts of Pallars Jussà. The reservoir lies between the Sant Antoni and Camarasa dams.

Cellers, in the municipality of Castell de Mur, is the only village on the reservoir shore; its roughly thirty inhabitants live between the water and the Lleida–La Pobla de Segur railway and the C-13 road. The monastery of Sant Miquel de Cellers, probably founded in 1170 by the counts of Pallars Jussà, lies submerged beneath the water.

The C-13 road and the Lleida–La Pobla de Segur railway run along the eastern shore, separating the village of Cellers from the water; the Hotel Terradets and a small boat landing stand beside them. The reservoir lies between the Sant Antoni dam upstream and Camarasa downstream. A trout fishing reserve operates in the Gabet area, and the marshy tail of the reservoir, about 112 hectares, is best visited on foot.

The reservoir's tail, around 112 hectares, has become a wetland of abandoned meanders and lagoons left by gravel extraction, with willow and poplar galleries and broad reedbeds. Look there for great crested grebes, little egrets, marsh harriers and pied avocets. Cellers, the only village on the shore, is separated from the water by the Lleida–La Pobla de Segur railway and the C-13 road.