The adriatic sea, mainly closed, is connected, or tied to the Jonin sea, and through it, one can get to to the mid east. Borders of the Adriatic sea and the Jonin sea are the gates of Otran, wide only some 75 km between Italy and Albania.

The Adriatic sea is mainly shallow. North of Pula, the depth does not exceed 50 m, south of Pula to Zadar 100 m (that area durring the ice age was part of the mainland). In the southern part of the Adriatic sea the are dramatic drops in depth (deepest being 1233 m).

The Adriatic sea is a relatively warm sea - temperatures do not fall below 11°C. Visibility is great as well.

Characteristics of the Croatian coast is the mountainous area along the coast (mountains along the coast, except around Zadar and western Istria), while the Italian coast is flat or much lower.

Sea currents are warm and flow along the coast from south to north, and along the Italian coast, from north to south. Tides are not emphasized.

The Croatian coast is considered one of the cleanest seas in Europe. At the same time, the Italian coast is somewhat considerably poluted (due to the polution from the river Po). Luckily, that polution does not affect the Croatian coast due to the currents.

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