The provinces of Cadiz and Huelva, in Andalucía, play host to this exciting competition which takes place in the Doñana National Park.

The participants must complete a circuit of 200 kilometres in a unique natural environment, starting in the streets of the historic centre of Cadiz . On bikes, they ride through some of the loveliest towns in Cadiz; swimming, they cross the Guadalquivir river where it flows through Sanlúcar de Barrameda; and the race continues on foot along the wild beach of the Doñana National Park, declared a World Heritage Site by the UNESCO.