The Quadrangular tower or Keep of the Fortress of Baku, is a 16 m historic tower located on Kichik Gala street, in the city of Baku, in  Katex, Azerbaijan.
Katex (Katekh; Avar: ) is a village at the foot of the Caucasian Mountains and the second most populous municipality in the Balakan District of Azerbaijan. Baku (US: /bku, bku/, UK: /bku, bku/; Azerbaijani: Bak, Azerbaijani: [bc (listen)) is the capital and largest city of Azerbaijan, as well as the largest city on the Caspian Sea and of the Caucasus region. 
