a firebox, which served to heat all the premises of the bath. The underground, the stables and the walls of the baths were heated by a branched system of heat-conducting channels. Ovdan Not far from the bathhouse is located the ovdan – a reservoir which was one of the largest in the Fortress of the Ovdans. This ovdan supplied drinking water not only to the palace, but also to the entire surrounding area. This assumption is confirmed by the nearby small, built in the 14th century Chin Mosque, which is believed to have served the residents of the nearby area. Ovdan supplied water to the palace bathhouse. Ovdan is a spacious reservoir located deep underground, which was ventilated by means of a special vertical shaft. Such a structure is typical for most of the ovdans surviving until the present day. To descend into the reservoir was possible by a gentle staircase, which was blocked by a lancet arch. Water came into the ovdan from a well-kept underground water pipe or kyhryza. The water intake structures of this water pipe were quite far from the city. In culture Images of the Shirvanshahs palace can be found on the works of such artists as Grigory Gagarin, Georgy Hohenfelden, in the photographs of Richard Thiele. In 1990, the postage stamp of the USSR, dedicated to the palace, was issued. Later, the image of the palace appeared on the postage stamps of the Republic of Azerbaijan. Also, Shirvanshah's palace was depicted on an Azerbaijani banknote with a face value of 10,000 manats. In June 2022, the Central Bank of Azerbaijan issued a new banknote that also shows Shirvanshahs Palace in the background. Description of the palace is found in the novel of Kurban Said "Ali and Nino." Palace complex in cinematography The architecture of the palace several times fell into the footage of Leonid Gaidai's film The Diamond Arm (1969), which was also filmed in the "old city" of Baku. Gallery See also Shirvanshahs' bath houses List of World Heritage Sites in Azerbaijan Old City (Baku) Architecture of Azerbaijan Literature Jonathan M. Bloom, Sheila Blair. The Grove Encyclopedia of Islamic Art and Architecture. – Oxford University Press, 2009. – Т. 2. – С. 240. – 513 pp. – . References External links Official website of UNESCO Walled City of Baku with the Shirvanshah's Palace and Maiden Tower UNESCO collection on Google Arts and Culture