Asparuh’s Rampart is a surviving example of early Bulgarian border fortifications, believed to date to the 8th century and built to protect the low coastline from seaborne, likely Byzantine, attacks.
As skilled warriors, the Proto-Bulgarians understood the tactical advantage of elevated terrain in battle. The lower section of Asparuh’s Rampart was built atop a solid core of compacted grey-black clay, sand, or stone masonry, often mixed with small amounts of brick and stone, providing a durable and stable foundation. The upper section consisted of a layer of clay-sand mixed with mortar, reinforced with abundant stones and broken bricks. Swamps still surround the rampart, suggesting that this “rock embedding” was employed to stabilize the structure over marshy terrain. Without such a foundation, it would have been impossible to spread and compact the initial layers of the embankment. The early Bulgarian builders took particular care to strengthen and consolidate the body of the rampart, demonstrating their advanced engineering knowledge and strategic planning.
When the deep sea-lake canal was excavated in 1976, Asparuh’s Rampart was divided into two sections, with the southern portion remaining visible today in Asparuhov Park.
Visitors can reach Asparuh’s Rampart and Asparuhov Park by buses 17, 17A, 46, and 60, alighting at the nearest stop "Detski kat".
