Varna Lake - the largest and deepest lake estuary oblong in the territory of the Bulgarian coast. Lake area - 17 square meters. km, the depth varies from 9, 5 to 19 meters. The origin of this natural reservoir - tectonic.

It is formed from the mouth of Provadiya river and lake from the Black Sea separates the two-kilometer strip of sand, which is regularly increasing. South Beach - steep and high, while the north - sloping. Lakeside bottom covers thick layer of silt, in some places up to 30 meters. In addition, the deepest place of the bottom covered with black hydrogen sulphide mud. It is used in order to mud, dirt Varna lake is very plastic and heat capacity, which enhances its healing properties.

The temperature of the lake and its level of salinity in largely under the influence of incoming sea water. In the spring of salinity of the water at the surface decreases and increases in summer and autumn. Due to the predominance of fresh salt water in a lake inhabited only by sea fish species.

The surface of the water in some places is warming up +25 ° C. The annual average temperature on the surface of about +14 ° C, at the bottom of the water warms no more than +8 ° C.

It is known that the area around the lake was inhabited by people in ancient times, as evidenced by found traces of lost civilizations. On the banks of Varna lake, archaeologists found a pile of construction, flint tools and canoes. It is also noteworthy that the north side of the lake, in a modern industrial zone of Varna, in 1919, was accidentally found the famous necropolis excavations which are still underway. In addition, one of the sublime shores of Lake overlooking the ruins of the Basilica of the period of the Genoese colony.