Qusar District (; ; ) is one of the 66 districts of Azerbaijan. It is located in the north-east of the country and belongs to the Guba-Khachmaz Economic Region. The district borders the districts of Quba, Qabala, Khachmaz, and the Russian Republic of Dagestan. Its capital and largest city is Qusar. As of 2020, the district had a population of 99,000. Toponymy There are several theories about the origin of the word "Qusar". One of them is that the word "qusar" comes from the Russian language, meaning "cavalry warrior". "Qusar" regiment was organized in this territory in 1783–1784. The district was probably named "Qusar" after the name of the regiment. There is another theory that the word "qusar" derived from an ancient Turkish tribe called "qus/ quz" with the prefix "ar" meaning male. Abbasgulu Bakikhanov used the word "qusar" in his book Golestan-i Iram to refer to a village. History The earliest sediments in the district belong to the Jurassic Period, 135–145 million years old. It is estimated that life in the Qusar district has been existing since the 2nd millennium B.C. Mahmudtapa, the hills of Monsar, the Govdushan hills, the hills of Hafla belonging to the Bronze Age, the hills of Kyzylgul and Agahan, the Halakhur hills belonging to the Middle Ages are ancient dwellings dating back to the 1st millennium B.C. The district was originated in 1930 and called Gil District with a centre in Gil village. In 1934, the centre of the district was moved to Qusar, and in 1938 it was renamed Qusar District. Administrative structure: Qullar village Urva village Geography Qusar is located in Eurasian continent, in the north-eastern inclination of the main Caucasus Mountain ridge. It is located between 41°11’41°45’ latitude North and 47°52’48°41’ longitude East. Mountains, among which is also Shahdagh Mount, take the great part of the rayon. The territory of the rayon occupies the northeastern part of Azerbaijan. Qusar is a unique gate of the republic. Even in ancient times, the territory of the rayon took a good position on a junction of the main trade roads. It is from Qusar to Baku, the capital of Azerbaijan. The local relief within Qusar district consists of mountains and valleys. Mineral sources such as limestone, chalcopyrite, limonite, and marble are common in the district. Qusar and Samur are main rivers of the Qusar District. Qusar rayon is located far from sea routes. The