Wetlands are one of the most important ecosystems on the planet but also one of the most sensitive and threatened. Transition ecosystems between aquatic and terrestrial environments are one of the richest and most productive ecosystems in the world in terms of biological diversity, with large concentrations of aquatic birds, mammals, reptiles, amphibians, fish and invertebrates, with water being the structuring element of these ecosystems.
 
Its enormous ecological and biological importance is closely linked to the fact that these ecosystems are privileged places for feeding, resting, sheltering, reproduction and wintering of several resident and migratory bird species and, in many cases, they constitute determinant habitats for the conservation of endangered species, such as the osprey (Pandion haliaetus), the marsh harrier (Circus aeruginosus) and the European pond turtle (Emys orbicularis).