Caracas is contained entirely within a valley of the Venezuelan central range, and separated from the Caribbean coast by a roughly 15 km expanse of El Ávila National Park. The valley is relatively small and quite irregular, the altitude with respect to sea level varies from between 870 and 1,043 meters (2,854–3,422 ft), with 900 meters (2,953 ft) in the historic zone. This, along with the rapid population growth, has profoundly influenced the urban development of the city. The most elevated point of the Capital District, wherein the city is located, is the Pico El Ávila, which rises to 2,159 meters (7,083 ft). The main body of water in Caracas is the Guaire river, which flows across the city and empties into the Tuy river, which is also fed by the El Valle and San Pedro rivers, in addition to numerous streams which descend from El Ávila. The La Mariposa and Camatagua reservoirs provide water to the city.