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Description: Derbent fortress is part of a grand defensive system that protected the peoples of Asia and the Caucasus Front from invasions of nomads coming from the north, and affects its greatness and in our days. The system included the citadel, city walls, wall Dag Mountain-Bars and sea walls. Strategically Derbent was located in the most vulnerable place, where the Greater Caucasus mountains approach the sea closest, leaving just a narrow three-kilometer strip of the plain. At the top of the hill next to the sea is Naryn-Kala citadel. Adjacent to the west of the citadel fortress two parallel walls blocked the way along the coast, leaving the eastern end of the sea, and preventing circumvention of the fortress in shallow water, form a protected on all sides by the harbor for ships. Between these walls and located the town of Derbent. And had dragged to the west of the citadel on the 40 kilometers of mountain wall was intended to prevent circumvention of the fortress on the mountain passes and valleys. In our time, it has been preserved only in part.