Salinity flow: Because the evaporation is greater than the precipitation, the salinity of seawater is higher, which is 36-39 ‰, higher than that of the Malak Sea and the Black Sea, thus causing the lighter seawater in the Black Sea to flow into the Aegean Sea from the sea surface through the strait, while the salty seawater in the Aegean Sea flows into the Black Sea through the lower channel. The tides between the Greek Peninsula and Evia Island are famous for their ferocity and variability. The surface seawater temperature is 24 degrees in summer and 10 degrees in winter. At the depth of 490 meters, the temperature fluctuates between 14 degrees and 18 degrees. A large amount of low-temperature water flows from the Black Sea to the northeast of Aegean Sea, which has certain influence on the water temperature in Aegean Sea. The water in the Black Sea contains less salt, which reduces the salinity of the Aegean Sea.
Biological resources: the ocean lacks nutrition, so there are few creatures. But the sea is clear and calm, and the temperature is very high, so a large number of fish come from other areas to lay eggs. Most islands are rocky and very barren. There are generally more trees in the northern islands than in the southern islands.
Strategic location: It is the only water area leading to the Mediterranean, Atlantic and Indian oceans by countries along the Black Sea, and plays an important role in shipping and strategy. The main coastal ports are Thessaloniki, Piraeus (Greece) and Izmir (Turkey).
The first in the world: Aegean Sea is the sea with the most islands in the world, so it is also called "multi-island sea". Most Aegean islands belong to Greece on the west coast, and a few belong to Turkey on the east coast. The largest island in the sea is called Crete. Crete, with an area of more than 8,000 square kilometers, is a barrier to the southern Aegean Sea.