Parque Natural Sierra de Grazalema Nature · Grazalema, Sierra de Cádiz, Cádiz The first Biosphere Reserve declared by UNESCO in Spain, in 1977; the municipality of Grazalema, with more than 2,000 mm of average annual rainfall, is one of the rainiest spots on the Iberian Peninsula. Reserva de la Biosfera desde 1977 Photo: Agnieszka Kwiecień (Nova) (CC BY 2.5) What to see and do in Grazalema