The seasonal pattern of its delta waters, which flood in winter and then drop in the spring, leaving rich deposits of silt, raised sandbanks and islands, gives Coto de Doñana its uniqueness. Conditions are perfect in winter for ducks and geese, but spring is more exciting; the exposed mud draws hundreds of flocks of breeding birds. In the marshes and amid the cork-oak forests behind, you’ve a good chance of seeing squacco herons, black-winged stilts, whiskered terns, pratincoles and sand grouse, as well as flamingos, egrets and vultures. There are, too, occasional sightings of the Spanish imperial eagle, now reduced to a score of breeding pairs. Conditions are not so good in late summer and early autumn, when the marismas dry out and support far less bird life.
It is no Iberian Arcadia, however, and given the region’s parlous economic state the park is under constant threat from development. Even at current levels the drain on the water supply is severe, and made worse by pollution of the Guadalquivir by farming pesticides, Seville’s industry and Huelva’s mines. The seemingly inevitable disaster finally occurred in 1998 when an upriver mining dam used for storing toxic waste burst, unleashing millions of litres of pollutants into the Guadiamar, which flows through the park. The noxious tide was stopped just 2km from the park’s boundary, but catastrophic damage was done to surrounding farmland, with nesting birds decimated and fish poisoned. What is even more worrying is that the mining dams have not been removed (the mines are a major local employer) but merely repaired.
Equally disturbing are the proposals for a huge new tourist centre to be known as the Costa Doñana, on the very fringes of the park. Campaigning by national and international environmental bodies resulted in this project being shelved, but the threat remains, much of the pressure stemming from local people who see much-needed jobs in this or similar proposals.