Urbión Peaks

The Picos de Urbión rise in the Iberian mountains between the basins of the Ebro and Duero. Near the highest peak are the springs of the Duero, which begins its long course westward across Castile. Ancient glaciers carved deep valleys and cirques into these heights; moraines helped retain the waters of mountain lakes, including the dark Laguna Negra. Pine woods spread over the lower slopes beneath the exposed rocky summits.