"Sunny Beach is a resort on the Black Sea coast of Bulgaria, located approximately 35 km north of Burgas in Nesebar municipality, Burgas Province. It is the biggest and most popular holiday resort of the country." - in: wikipedia.
"The southern Bulgarian coast is washed by the Black Sea. 380 km marvelous strech of beaches, calm and safe sea, clear water and healthy air, fine golden sand and natural dunes, mineral water springs, blue flag winning resorts, holiday villages and campsites. Average air temperature in the summer is about 28°C, water temperature - 25°C. There are more than 240 hours of sunshine in May and September and more than 300 hours in July and August." - in: http://south-bulgaria.hit.bg/about.htm
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