Why is the Baltic Sea one of the least salty seas in the world?

The Baltic Sea is located in northern Europe, and it is one of the arms of the Atlantic Ocean, but the water exchange between them is limited. The low salinity of the Baltic Sea water is due to several reasons . The Baltic Sea is almost closed, its outlets are very shallow, and the longest rivers that flow into it pass through regions with a good climate. Mild continental, which keeps water evaporation rates low, and increases the intake water as spring snow melts, and this reduces the salinity of the Baltic Sea waters. More about the Baltic Sea.