The "Dune di Marinella SIC"  is actually a bit farther north than the one shown here. 
For the correct location of this boundary please see:
https://natura2000.eea.europa.eu/?query=Natura2000Sites_9883_0,SITECODE,IT9320100

It would be actually good if you could load the boundaries of all the EU SIC sites (only very few of them currently available) as they represent the EU wide network of EU protected areas under the Habitat Directive legislation (thousands of sites). Spatial data can be downloaded here: https://www.eea.europa.eu/data-and-maps/data/natura-11/natura-2000-spatial-data