Lake VarnaVarna, Bulgaria
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An extended estuary on the coast near Varna, which is connected to Beloslavsky Lake and the Gulf of Varna through shipping channels. The pond has an area of 17 km² and a relatively shallow depth of only 19 meters. Its bottom is covered with a layer of silt and hydrogen sulfide mud, which has healing properties. Near the lake is the famous Varna Necropolis.