Northern wall of the Derbent fortress

The construction of the existing northern city wall of the Derbent Fortress is dated to the 6th century. Its construction is associated with the name of the ruler of Sasanian Persia, Khosrow I Anushirvan (531 – 579 AD). The northern wall stretches 3.5 km from the Naryn-Kala citadel along the northeastern slope of the Jalgan ridge spur eastward to the sea. The wall is almost completely preserved and features a large number of protrusions and towers for better defense against enemies. Facing regions inhabited by numerous warlike nomadic tribes, it bore the brunt of enemy attacks. Therefore, it had a large number of defensive towers spaced approximately 70 meters apart. The northern wall was built with maximum use of the terrain relief and constructed from local shell limestone, known for its resistance to weathering. The height of the walls at the tower locations is 8-12 meters. The original masonry is well preserved along almost the entire length of the surviving walls. It consists of facing rows laid dry with large stones and rubble filled with lime mortar. The thickness of the wall varies from 230 centimeters to 380 centimeters. The northern wall includes 45 towers, 79 construction marks and drawings, gates: "Dzharchi-Kapy," "Kyrkhlyar-Kapy," "Dash-Kapy," and the discovered monument "Kiyat-Kapy gate." One of the elements of the northern wall is also a lighthouse built in 1853.

Source: 

https://derbentmuseum.ru/monuments/steny-derbentskoj-kreposti-severnaya-stena/