The Pisuerga river rises in the Covarrés glacier (2143 mbsl), in the Valdecebollas peak (La Pernía, Palencia). It flows through the Sel de la Fuente and goes subway, emerging in the Peña Labra mountain range, in the Cantabrian Mountain Range, near Santa María de Redondo. It has a length of 283 km. It serves as a border between the provinces of Palencia and Burgos for a large part of its route. Then, it continues through the Province of Valladolid, passing through Valladolid and Simancas, until it flows into de Duero River, next to the municipalities of Geria and Villamarciel (Tordesillas, Valladolid). The fundamental forest mass of the territory is constituted of pines, holm oaks and quejidos, with pine forest also standing out for their richness in resins, wood and pine nuts.
