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\section{Adriatic Sea morphology and bathymetry}  The Adriatic Sea is a latitudinally elongated continental basin, with length and width of 800 km and 180 km respectively and with its major axis oriented along the northwest–southeast direction. It is located in the central Mediterranean, between the Appennines chain and the Balkans and is connected to the Ionian Sea by the 74 km wide Otranto strait.  Marked morphological differences characterize the basin along its longitudinal transversal axes. Accordingly the Adriatic Sea can be divided into three sub-basins (Artegiani et al., 1996 a). 1996).  Its The  northern section sub-basin  is very shallow and gently sloping, with characterized by  an averagebottom  depth of about 35 m.   The northern sub-basin spans from the northernmost part to m and gently slopes toward  the 100 m bathymetric line (in front of Giulianova, Italy) and is characterised by an extremely shallow mean depth (about 30 m) with a very weak bathymetric gradient along the major axis, and by a strong river runoff (~ 3000 m3 s-1) relative to the receiving basin; in fact, Po and the other northern Italian rivers are believed to be the source of about 20% of the total Mediter- ranean river runoff (Hopkins, 1992). The middle Adriatic is 140 m deep on average, with the two Pomo Depressions reaching 260 m.   The middle Adriatic is a transition zone between the northern part and the southern sub-basin which shows some open sea conditions. This central zone spans from the 100 m contour to the Pelagosa sill (about 170 m depth), located around the line con- necting Vieste and Split. It is characterised by two depressions, the Pomo (or Jabuka) Pits, having a maximum depth of about 270 m.