The Tres Amigos trail extends in an important natural reserve area in the city of Cadiz, and takes visitors and adventurers to the city on an interesting journey through fertile natural lands and views of paradise. Tres Amigos is one of the most important coastal waterfowl breeding wetlands in Europe, a priority area for nesting, resting and feeding for many waterfowl and an essential breeding ground for many species of fish and invertebrates.