It’s about 5 kms – 10 minutes drive north from the busy purpose-built resort of Sunny Beach (“Slanchev Bryag”). Nessebar is about 9 kms.

“Sveti Vlas ( known as St Vlas) (Bulgarian: Свети Влас, is a town and seaside resort on the Black Sea coast of Bulgaria, located in Nessebar municipality, Burgas Province.
Area code(s): 0554 Postal Code: 8256” (source Wikipedia – the free encyclopaedia)

map of st vlas, bulgaria