Hoyo de Manzanares 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 Parque Regional de la Cuenca Alta del Manzanares created by the community of Madrid in 1985. The Parque Regional de la Cuenca Alta del Manzanares is the oldest and most protected regional park in the community of Madrid. As a result, Hoyo de Manzanares is
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