Terradets Reservoir Nature · Castell de Mur, Pallars Jussà, Lleida The Terradets reservoir is a dam built in 1935 on the Noguera Pallaresa river, in Pallars Jussà, extending through Llimiana, Gavet de la Conca and Castell de Mur, at the foot of the Montsec massif. The dam, a concrete gravity dam, is 47 metres high with a 160-metre crest length, and holds back 33.2 cubic hectometres over 330 hectares; it is used for hydroelectric production, irrigation and water supply. The tail of the reservoir has become a wetland of about 112 hectares, with meanders and lagoons where great crested grebes, little egrets and avocets breed, and where trout, carp and barbel are fished. Its construction flooded the medieval monastery of San Miguel de Cellers, founded around 1170. It has trails for discovering the area's fauna and flora. Photo: Jorge Franganillo (CC BY 2.0) What to see and do in Castell de Mur