The valley of Posada, in practice created by alluvial sedimentation at the mouth of the Rio Posada, contains a wealth of natural interest.

Already the peculiar geological conformation maintained a certain difficulty of access to land discoveries, the displacement of many ponds and swamping, flemme the various sections of the river, has certainly had a role of fundamental importance in the preservation of endemic and rare plant and animal, having actually kept at bay the physiological processes anthropization.

Even disinfecting anti-war conducted by the Rockefeller Foundation running of the famous Marshall Plan, has not left clear traces of his passage have not found residual contaminants (DDT) to a verification carried out a few years ago.

So today it is still possible to practice naturalistic observation, sometimes without even leaving the paved roads, interesting and valuable. From freshwater turtle to knight of Italy, the areas offer different scenarios fauna rather unusual, since those entomological, ornithological and botanical unique.

Even the sea, although now deprivato fish by trawling, evocatively remains untouched, and because of the size of the beaches that is not risk of overcrowding (the Gulf of Posada stretches from the tip of a Orvile Siniscola of Saint Lucia, for about 20 km) and by the ratio between the length of the beaches in front of backgrounds directly exploitable (ie non-humid areas).

As in the rest of Sardinia, are currently Corsican programs building massive scale, which some construed as a threat to the environment as areas now coming about at the edge of wetlands. This trend, which has no real economic basis, because the masses are already well above the question of tourist accommodation has almost definitely avvicendato previous projects construction of a river park protected (90s).