The Guadiana River, or Odiana, is an international river defining a long stretch of the Portugal-Spain border, separating Extremadura and Andalusia (Spain) from Alentejo and Algarve (Portugal). The river's basin extends from the eastern portion of Extremadura to the southern provinces of the Algarve; the river and its tributaries flow from east to west, then south through Portugal to the border towns of Vila Real de Santo António (Portugal) and Ayamonte (Spain), where it flows into the Gulf of Cádiz. With a course that covers a distance of 829 kilometres (515 mi), it is the fourth-longest in the Iberian peninsula, and its hydrological basin extends over an area of approximately 68,000 square kilometres (26,000 sq mi).
The Guadalete River is located almost entirely in the Spanish province of Cádiz, rising in the Sierra de Grazalema Natural Park at an elevation of about 1,000 metres (3,300 ft), and running for 172 kilometres (107 mi) into the Bay of Cádiz at El Puerto de Santa Maria, north of the city of Cádiz. The river's name comes from the Arabic phrase وادي لكة meaning "River of Forgetfulness".
The Manzanares is a river in the centre of the Iberian Peninsula, which flows from the Sierra de Guadarrama, passes through Madrid, and eventually empties into the Jarama river, which in turn is a right-bank tributary to the Tagus.
Soto del Real, whose former name was Chozas de la Sierra, is a town and municipality in the northern area of the autonomous Community of Madrid which had 8,294 inhabitants in 2009.
Colmenar Viejo is a town and municipality of about 48,614 inhabitants, located in the Community of Madrid, Spain, 30 kilometers north of Madrid on the M-607 motorway. It belongs to the comarca of Cuenca Alta del Manzanares.
The Sierra de Guadarrama is a mountain range forming the main eastern section of the Sistema Central, the system of mountain ranges along the centre of the Iberian Peninsula. It is located between the systems Sierra de Gredos in the province of Ávila, and Sierra de Ayllón in the province of Guadalajara.
Manzanares el Real is a 8,936 inhabitant town in the northern area of the autonomous Community of Madrid. It is located at the foot of The Pedriza, a part of the Sierra de Guadarrama, and next to the embalse de Santillana.
El Atazar Dam is an arch dam built near Madrid, Spain on the Lozoya River, very close to where the Lozoya joins the Jarama. The curved design of the dam is optimum for the narrow gorge in which it was built to retain water in the reservoir. Arch dams are thin and require less material to construct than other dam types.
The Almendra Dam, also known as Villarino Dam, in Salamanca, Spain, interrupts the course of the River Tormes five kilometres from the village from which it takes its name: Almendra. It was constructed between 1963 and 1970.
The García Sola Reservoir is a reservoir located in the town of Castilblanco in the autonomous community of Extremadura, Spain.
The Alarcón Dam is a gravity dam on the upper course of the Júcar River. It is located 6 kilometres (3.7 mi) from Alarcón, in the province of Cuenca, in the autonomous community of Castilla-La Mancha, Spain.
El Salto Dam, located on the Guadalquivir River in the municipal district of El Carpio, comprises a dam and its corresponding hydroelectric power station.
Bolarque Dam is a concrete gravity dam on the Tagus in Spain, where the river forms the border between the provinces of Cuenca and Guadalajara. About 6 km downstream from the dam is the José Cabrera Nuclear Power Station.
Mequinenza Dam is a concrete gravity dam in the province of Zaragoza, Spain. It impounds the Ebro creating a large reservoir, which is called Mar de Aragón. About 35 km downstream of Mequinenza dam is Ribarroja dam.
Ribarroja Dam is a concrete gravity dam located in the province of Tarragona, Spain, that impounds the Ebro. About 35 km upstream of Ribarroja dam is Mequinenza dam. About 15 km downstream is Flix dam.
The Cerrón Grande Reservoir, also known locally as Lake Suchitlán, is a reservoir in northern El Salvador and the largest body of fresh water in the country. The reservoir was filled between 1973 and 1976, subsequent to the construction of the Cerrón Grande Hydroelectric Dam. The Cerrón Grande Reservoir is among the most polluted bodies of fresh water in Central America.
Madrid Río is an urban park in the Spanish capital Madrid, built along an urban stretch of the Manzanares River following the burial of the M-30 bypass road in this area. It is the result of a project led by the architect Ginés Garrido, who won the international ideas competition organised by the Madrid City Council in 2005 to redevelop the area.
The Cuenca Alta del Manzanares Regional Park, created in 1985, is the natural space protected area with the largest extension in the Community of Madrid (Spain) and one of the most ecologically and scenically valuable. It is located in the northwest of the region and extends around the upper course of the Manzanares River, along 42 583 ha. Its main municipalities of reference are Manzanares el Real and Hoyo de Manzanares. Unesco declared it a Biosphere Reserve in 1992.
The Sierra de Hoyo or Sierra de Hoyo de Manzanares is a mountain chain located in the northwest of the Community of Madrid (Spain), near the Sierra de Guadarrama. Geologically it belongs to this mountainous formation, but there is a flat separation of about ten kilometers between the two. Its main municipality of reference is Hoyo de Manzanares, located on its southern slope, from which it takes its name.
