Atanasovsko Lake is a local favorite for its curative mud and lye. You can lie in the pools of lye and then apply black mud on your skin. The beach is less than 100 m (300 ft) away, and there are showers. There is a free parking lot, but you can also reach the area on foot or by bike through the Seaside Park (Burgas has an urban bicycle rental system).
The Atanasovsko Lake is a busy bird-watching spot too—316 out of a total of 423 bird species found in Bulgaria can be spotted here. The lake is hyper-saline and has been used for extracting salt for more than a century.