Monasterio de Piedra (Piedra Monastery) is a monastery, hotel and park complex in the Iberian System mountain ranges, near Nuévalos, province of Zaragoza, Aragon, Spain.
The monastery is located near the Piedra River Canyon, home to many species of birds, damselflies, trout, and endangered fish like the South-west European nase and an endangered species of barbel. The canyon itself includes a network of mossy, garden-like caves (natural and man-made), waterfalls and lagoons that contrast with the otherwise dry hills of southern Aragon.
The dissolution and precipitation of local limestone has created numerous rivulets, springs, and Karst topography. The Piedra River meanders around a mountain known as “El Espolón” (The Ram). In 1959, a dam was constructed across the river which created the 1300 acre La Tranquera Reservoir, flooding part of the canyon, some of the best local farmland, and several villages. The roofs of some drowned houses can still be seen when the water levels are down. The reservoir provides a domestic water supply, irrigation and electrical energy. (Description from Wikipedia)