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Standing close to the high mountains are the ruins of Chirag-Kala fortress which used to be a key structure of the Gilgilchay fortress defense system. It was shaped like an irregular rectangular (160 õ110 m ) . From the northeast the fortress wall was protected by a deep moat. All other sides of it had a thick, high wall with 13 towers. Today only the ruins of these towers have survived. The towers were successfully used to signal alarm in case of danger (Chirag-Kala means " Lamp Tower "). the fire set on the tower tops was visible from many kilometers away. In this way Chirag-Kala was a kind of an "informant" and was the major one within the signaling system of the medieval strongholds
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