The region of Aragon lies in the North Eastern part of the Spanish mainland. The majority of the Ebro River and its river basin can be found in the region. Aragon borders France in the North, Catalonia and Valencia in the East, Castile-La Mancha in the South, and Castile and Leon, La Rioja and historic Navarre in the West. The region can be separated into three different areas: the central area consisting of the Ebro basin, the northern area where the Pyrenees lie and the area made up of the Iberian mountain range. The Ebro basin is vast flat lowland arising around the axis formed by the Ebro River, bordering with the Pyrenees in the North and with the Iberian mountain range both in the Northwest and Southeast of the region. The Pyrenees reaches its highest peaks in Aragon, which include Aneto (3,404 Mts.), Monte Perdido (3,355 Mts.), Maladeta (3,308 Mts.), Tres Sorores (3,353 Mts.) and Posets (3,375 Mts.). The Iberian mountain range stretches over most of the South eastern part of the province of Zaragoza and over most of the province of Teruel. The most notable peaks are Moncayo (2,315 Mts.) in the North and the summits of the Universales mountains (1,617 Mts.) and the Javalambre sierra (2,020 Mts.) in the South. Aragon's water network is marked by the Ebro river basin. The tributaries that flow from the Pyrenees have larger quantities of water in them, than those deriving from the Iberian mountain range. The region of Teruel, lies South of the Albarracin and Gudar sierras, located in the Guadalaviar-Turia and Mijares river basins.