Hoyo de Manzanares university named the Universidad Antonio de Nebrija. The Academy of Engineers of Madrid, founded in 1803, is located in Hoyo de Manzanares, Madrid. This academy contains one of the largest libraries of northern Madrid, containing various donated volumes of books about the Spanish Civil War. Hoyo de Manzanares It has a stable population of roughly 7,457 residents (INE 2008), a statistic that has been increasing consistently from the economic crisis. The population also greatly increases during the summer as a result from various families who own summer houses in the area. This district of Madrid is found inside of the
Eresma River several streams forms the river. Most of these streams descend from the slopes of mountains like Peñalara, Siete Picos and Montón de Trigo. Its most important tributaries are Moros and the Voltoya that flow northward, passing through San Ildefonso, Palazuelos, and through the city of Segovia; which it surrounds in a closed meander. Eresma river then runs northwest, passing near Hontanares, Los Huertos, Bernardos, Navas de Oro, Coca and Villeguillo. It enters the province of Valladolid through Olmedo, Pedrajas, Alcazarén and Hornillos. Later it flows from the right into the Adaja in Matapozuelos. Eresma river has pluvio-nival regime, which means