International Tagus Natural Park Natural Park, Sierra de San Mamede and Sierra de San Pedro.
International Tagus Natural Park.
Declared a nature reserve in 2006, it covers 25,000 ha of both Spain and Portugal. The banks of the Tagus River here and its tributaries form a catchment area of approximately 48,000 hectares. The park is one of the most important places of Extremadura as far as plant life is concerned. It is a prime example of Mediterranean sub-humid forest, with species such as oak, cork oak, madrone, cornicabra or durum, and most representative is the vegetation of its banks with wild olive, Kermes, mastic, juniper, jasmine, and narcissus with special reference to the Narcissus fernandessi, Lusitanian lily (Iris lusitanica), tulip bush (Fritillaria lusitanica) and the sundew lusitanica.

Also very important is its wealth of wildlife such as the Iberian Emerald lizard (Lacerta schreiberi), the European pond turtle (Emys orbicularis), Cabrera´s vole (Microtus cabrerae), Mehely´s horseshoe bat (Rhinolophus mehelyi), native crayfish (Austropotamobius pallipes lusitanicus) and common otter (lutra lutra). But undoubtedly the most important of the park's wildlife are the birds.
Ornithology

Routes (guided):
Mirador de Fuente de la Geregosa
Negrales Viewpoint
Buraco Viewpoint
Aurela Bridge
Black Mill
Salor mines.
 
Natural Park Sierra de San Mamede.
The Sierra de San Mamede is a small mountain range with 4 notable peaks: Marvao, Castelo de Vide, Sierra Fria and San Mamede. The park covers 31,760 hectares and includes many interesting towns with unique architectural elements. It is also home to more than half of the bird species that breed in Portugal.

Route:
Castelo de Vide – Marvao
Porto da Espada - Sao Juliao - Montinho
Pico Sao Mamede
 
Sierra de San Pedro Special Protection Area (ZEPA).
Composed of a number of medium-altitude mountain ridges, capped by quartzite rocks and aligned southeast to northwest, it covers an area of 83,000 ha. The dominant plant species is undoubtedly the cork oak, along with other trees and shrubs of the Mediterranean forest. As far as wildlife is concerned, it has an unparalleled wealth of species with an abundance of deer and wild boar, and has the highest density of breeding pairs of Spanish imperial eagle (Aquila adalberti) in the world.

Routes:
Castle Piedrabuena
Bank of Albarragena