Greece contains 21 major rivers that spawn additional tributaries. Many of the rivers, which often originate in other countries, are shallow and turbulent, making them difficult or impossible to navigate by boat. However, the ecosystems established next to the rivers and their estuaries, as well as cultural events in the towns surrounding them, show these rivers are still an important part of the country’s geography.
Aliakmon is the longest river of Greece; 320 km long, rising in the mountains near Lake Prespa, N Greece, and flowing SE then NE into the Thermaic Gulf. The Aliakmon forms the western part of the extensive Vardar River delta. It is also known as the Vistritsa River