Saints Constantine and Helena is a resort town on the Bulgarian Black Sea coast within a landscaped park 10 km north of downtown Varna, 2 km east of its Vinitsa quarter, and 7 km south of Golden Sands. Bulgaria's oldest Black Sea resort was also known in the past as Druzhba and Varna Resort. It is served by the Varna International Airport and bus lines of the Varna public transit system.

Landmarks include the 16th-century Eastern Orthodox monastery of Sts. Constantine and Helena, the Euxinograd royal summer palace, park and winery, and the Sofia University Botanical Garden, also known as Ecopark Varna. One of the best preserved medieval settlements in the country, Kastritzi, also mentioned by the Crusaders in 1444 as Macropolis, was unearthed in archaeological excavations inside Euxinograd. In the mid-14th century, Kastritzi was a bustling port of the Second Bulgarian Empire frequented by Venetian, Genoese, Ragusan, and Byzantine merchant ships.

Constantine and Helena also comprises the Grand Hotel Varna and Sunny Day luxury resorts and several villa communities. There are sandy beaches, punctured by rocky promontories, hot mineral springs, modern hotels, and sports and health facilities, including spa centres and yacht marinas.