St. Vlas is hidden in the eastern part of the Balkan Mountains, in close proximity to the Black Sea Coast. Now its coast is growing into the most picturesque holiday spot on the Black Sea Coast. The air currents between the sea and the mountain create a unique natural phenomenon that purifies the air. The natural sea breeze in combination with the crystal clear air creates conditions for sea balneotherapy and has a positive effect on patients suffering from asthma and other lung diseases. The favourable climate is suitable for year-round treatment.