The Río Lobos Canyon in San Leonardo Nature · San Leonardo de Yagüe, Pinares, Soria Image of San Leonardo de Yagüe, not of the place itself. The municipality shares the Cañón del Río Lobos natural park, created in 1985 and also protected as a Special Area of Conservation and an SPA within the Natura 2000 network, where the river carves a limestone gorge amid juniper groves and cliffs with colonies of griffon vultures. The gorge, cut into Upper Cretaceous limestone, is the result of double erosion: the wearing of the riverbed itself and the dissolution of the rock by water, which has left enormous cliff faces and an extensive karst landscape of caves, sinkholes and swallow holes. Its more than 10,000 hectares are shared between San Leonardo de Yagüe and other municipalities of Soria and Burgos, such as Ucero, Casarejos and Hontoria del Pinar, and a new plan under way would extend the protected area. Photo: Luis Rogelio HM (CC BY-SA 2.0) What to see and do in San Leonardo de Yagüe