Sierra de San Serván Nature · Arroyo de San Serván, Tierra de Mérida - Vegas Bajas, Badajoz Image of Arroyo de San Serván, not of the place itself. It reaches 608 m at the Cerro de San Serván, west of the municipality, and preserves rock shelters with schematic cave paintings dated to roughly between 1500 and 500 BC. Photo: Adolfobrigido (CC BY-SA 4.0) What to see and do in Arroyo de San Serván