The region of southeastern Bulgaria is bordered by the Black Sea to the east, and as a coastal region with wide sandy beaches, it is the most visited region in Bulgaria, and includes the famous Sunny Beach resort, which is a resort that includes more than 800 beach hotels along the Black Sea coast, and is known for its lively nightlife. It is also the most famous and largest beach resort, attracting tourists from all over the world. In addition, the region includes the ancient city of Nessebar, which is a UNESCO World Heritage Site, and is said to contain the largest number of churches, along with a group of other ancient cities dating back to the Greek era, which were important ports for the Romans, Byzantines, Bulgarians, and Ottomans. It also includes The area has many archaeological sites from Thracian to Ottoman, and in the west of the area is the Kapil National Archaeological Reserve, one of the most important settlements of Thrace in Bulgaria.