That plateau is rarely flat, and is in reality a mostly hilly highland area divided by the Cordillera Central (mountains), and then ringed by additional mountain ranges, north, east and south. In the west the Meseta slopes gently down into neighboring Portugal.
Significant mountains in Spain include the limestone Cordillera Cantabrica and rugged Sistema Iberico (north); massive Pyrenees (northeast) where many peaks exceed 3,000 meters; the deeply eroded and rocky Sierra de Cuenca(east), and the lower Montes de Toledo and Serrania de Cuenca (south-central).
Significant lowlands include the fertile Andalusian Plain in the southwest, and the Ebro River Basin in the northeast. In addition, much of Spain is fronted by a low and narrow coastal plain, one that separates the mountains from the sea.
Those deeply indented coastal areas include countless bays and coves, and most have sandy beaches. In the far northwest, along the Bay of Biscay, rugged cliffs front the coastline.
In the far south, the Strait of Gibraltar separates Spain and Europe from Morocco (Africa), and here, the two continents are only 13 km (8 miles) apart.
The country is drained by an estimated 1,500 rivers (mostly small). The longest and most significant riversinclude the Douro (Duero), Ebro, Jucar, Tagus (Tejo), Guadiana and Guadalquivir.