New Castle of Manzanares el Real was abandoned once the new castle was built. The castle now houses a museum of Spanish castles and hosts a collection of tapestries. It was declared a Monumento Histórico-Artístico in 1931. It is owned by the Duchy of the Infantado, but its management is the responsibility of the Community of Madrid. The lands bordering the upper reaches of the River Manzanares, rich in pastures and forests, were the subject of frequent disputes between different powers that emerged after the Reconquista. The communities of Villa y Tierra de Segovia and Madrid had several disputes over the 13th century, which were resolved
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