Serpentara lies in the north-eastern section of the MPA and Variglioni are situated within Zone A. Here diving is allowed with the authorized diving center along the ridge sloping down from the rock characterized by big boulders with a vertical course forming a landscape of peaks and steep drops surrounded by landslides formed by big blocks. The bottom quickly slopes down to over 30m and the diving activity develops at about 25m.
The slope and the blocks are covered with photophilic seaweeds and a thick presence of Caulerpa racemosa. At greater depths, white sea fans (Eunicella singularis) and yellow sea fans (Eunicella cavolinii) become more frequent and animate the landscape with their branches. The shady areas are covered with orange sponges, yellow sponges, and yellow cluster anemones. The purple starfish, a protected species, is very widespread.
Already from the first meters of depth, it is possible to meet large shoals of barracudas sneaking among the rocks and in the channels among the peaks. From the blue, dentexes and Atlantic bonitos looking for preys come. The ravines conceal groups of brown meagers swimming elegantly.
Curious groupers peep out among the boulders.