Upper Basin of the Manzanares Regional Park

The next step in the protection of the area influenced by the Manzanares River was taken in 1978 when, by Royal Decree, the Cuenca Alta del Río Manzanares Natural Park was created, which extended the protection margins of part of the Guadarrama Mountain Range, including La Pedriza. This protected area would be the real precedent of the Regional Park that was officially established with Law 1/1985, of 23 January 1985, on the Declaración de Parque Regional de la Cuenca Alta del Manzanares (Declaration of the Regional Park of the Upper Manzanares River Basin).

After two extensions of the protection zone, in 1987 and 1991, and being a Protected Natural Area and a Regional Park, there was only one step left to definitively guarantee its conservation and natural importance: its declaration as a Biosphere Reserve by UNESCO on 9 November 1992.

All of these declarations and regulations are essential to correctly regulate this enormous and extremely important space whose surface area covers 42,583 hectares and 18 municipalities, and completely includes under its protection the population centres of Manzanares El Real, Hoyo de Manzanares and Tres Cantos.

The fact that the Cuenca Alta del Manzanares Regional Park is a Protected Natural Area implies that it contains natural systems and elements representative of its landscape, endemic, which may be threatened or fragile, but which are of special interest and the conservation of their diversity must be guaranteed. Their relationship with the human populations that have developed and adapted to their environment, modifying their landscape to make it worthy of protection, is also essential.

As a Biosphere Reserve, its international regulations ensure its biological conservation, the conservation of its traditional systems of human use and its natural, economic and educational management. To this end, UNESCO conceives three protection zones which guarantee this symbiosis: the transition zone, where the controlled development of the population centres bordering this natural space is permitted; the buffer zone, subsequent to the previous one, where only activities compatible with the conservation of the natural environment are allowed; the core zone, the furthest away from urban settlements, where the greatest protection of the biosphere reserve is established.

In the Regional Park there are three areas marked mainly by their orographic differences. Thus, the highest areas stand out for their granite and gneiss formations, with vegetation adapted to the rocky soils such as lichens, mosses, supra-arboreal grasslands, junipers, brooms, fruit bushes such as blackberry, and aromatic plants such as rosemary or wild lavender. The fauna in this area, also adapted, is characterised by small mammals that find sufficient food in this environment, as well as shelter, with the exception of the mountain goat, which is perfectly adapted. The black vulture and the griffon vulture are the great stars of the avifauna in this area, and a rich herpetofauna that finds in this niche one of the few places to survive, such as the ocellated lizard or the mountain lizard.

The mid-altitude zone of the Regional Park is occupied by the Sierra del Hoyo, close to population centres such as Moralzarzal, Galapagar, Hoyo de Manzanares and Torrelodones. This demarcation is characterised by less elevated mountains and smoother contours, with richer, earthier soils than the previous area, where holm oaks, juniper forests, oak groves, cypresses, mountain and reforestation pine forests, cork oaks, and a wide range of Mediterranean vegetation such as gum rockrose, rosemary, thyme and lavender, proliferate. Here the variety of fauna whose food and shelter is in the trees increases, so we find rabbits, roe deer, squirrels, weasels, fallow deer, genets, wild boar and foxes, for example, as well as birds of different sizes and habits, such as the cuckoo, the great spotted woodpecker, the golden eagle, the eagle owl, the booted eagle, the red kite, the goshawk or the kestrel. The herpetofauna in this area also increases thanks to the wetlands and ponds formed by the Manzanares River, where we can see vipers, viperine snakes, racer toads and long-legged frogs.

The last area, the lowest in its orography, corresponds to the plains and low valleys of the Sierra de Guadarrama, where the mountains of El Pardo and Viñuelas are also found. This area is, historically, the most affected by anthropic action, as it is the lowest in altitude, composed of earthy soils and highly fertile silts, which make the conduction of water from the rivers easier. This action has created unique landscapes that today also form part of the natural and ethnographic heritage of the Regional Park, such as holm oak groves and ash wood pastures, whose exploitation and maintenance are still of communal use. This vegetation coexists with birch, juniper and cork oak groves, steppes, pastures, shrubs and wetlands, a wealth of vegetation that shelters the same fauna found in the previous zone, only multiplied and enriched by aquatic birds and fish that inhabit the reservoirs of Santillana and El Pardo.