Parque Natural de Cornalvo Nature · Mérida, Tierra de Mérida - Vegas Bajas, Badajoz Declared a natural park on 19 November 2004, it covers 11,601 ha spread across Mérida, Aljucén, Mirandilla, San Pedro de Mérida, and Guareña. It preserves holm oak and cork oak dehesas, riverside forests, and more than 250 vertebrate species, including the black stork and the jarabugo, a fish endemic to the Guadiana basin. It includes the Roman dam of Cornalvo, declared a Monumento Nacional in 1912. Photo: Parnacor15 (CC BY-SA 3.0 es) What to see and do in Mérida