The Adriatic Sea is a part of the Mediterranean Sea.

Coastline:
5,835.3 km, of which 4,058 km comprise the coastlines of islands, solitary rocks and reefs.

Number of islands, solitary rocks and reefs:
1,185; there are 47 inhabited islands.

The quality of the water in the Adriatic is very well preserved. The results reached through the constant measuring of the quality of water on more than 800 beaches are in accordance with the strictest criteria. Except for the cleanliness of the sea, another important quality of the coastal area is its biological and geographical particular quality, which can be seen in the number of species of plants and animals, and in the high number of endemic species (for example human fish).

The average annual temperature of the sea is 11°C. During the winter, the sea is the coldest and the surface temperature is about 7°C; very seldom, it can drop below that too. In the spring, the sea becomes warmer, and the surface temperature rises to 18°C. In the summer the surface of the sea reaches a very high temperature, of up to 25 to 27°C.

The areas along the Adriatic coast have a pleasantly mild Mediterranean climate with a large number of sunny days; summers are dry and hot and winters mild.