El Garraf Natural Park and the Olèrdola County Park make up the southwest spur of what is known as the Catalan Coastal Mountain System, which extends over the counties of El Baix Llobregat, L´Alt Penedès and El Garraf. Its boundaries are the lower valley of the River Llobregat, the Mediterranean Sea and the Penedès depression. Together they cover 12,984 hectares (El Garraf covers 12,376 ha and Olèrdola 608 ha).
The two parks consist predominantly of rocky and rugged landscapes, characterised by calcareous rock with a large number of cavities, dolines and sinkholes. El Garraf nevertheless has a small reddish sandstone strip at the eastern end of the park while the plain surrounding Olèrdola is covered with vineyards.
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