.... Sierra del Rincón was declared Biosphere Reserve in 2005.

...  Sierra del Rincón contains more than 1000 different vertebrate animals and plants species, of which more than 200 they are rare, endemic or are threatened.

... Sierra del Rincón occupies a surface of approximately 15.000 hectares, the equivalent one to 15.000 football fields.

…Sierra del Rincón Biosphere Reserve is located in the north of the Community of Madrid, concretely in the municipalities of La Hiruela, Horcajuelo de la Sierra, Montejo de la Sierra, Prádena del Rincón and Puebla de la Sierra.

…The territory of Sierra del Rincón is between the 900 and 2047 m of altitude, which makes that many ecosystems of great value coexist.

…Sierra del Rincón Biosphere Reserve is including within a World Network of Biosphere Reserves, composed at the moment by almost 500 Biosphere Reserves.