Manzanares (river) it flows near the dormitory town of Arganda del Rey, ending its journey. The river Manzanares, although small and relatively unimportant geographically, has had a great historical importance due to its close relation to the city of Madrid. The city was founded by the Moors as a citadel overlooking the river in the ninth century. The river is also featured in many paintings of the late 18th to early 19th-century painter Francisco de Goya, which show traditionally dressed "Madrileños" in activities like dancing or having picnics next to the river. The Manzanares was also an important defence line for 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