[2] According to the Oxford Concise Dictionary of World Place-Names, the word literally means "man" and derives from Lezgin kus.

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.

[5] In 1837-1839, there were uprisings led by imam Muhammad Huluhvi luk and abrek Ali Hilivi in the territory of Kuba province and in the south of Dagestan.

[6] The main reason for the uprising was the intensive displacement of the Lezgin population from Guba, Gusar and Khudat.

Administrative structure: On 19 September, 2024, the Islamic State attacked Azerbaijan in the Qusar District, kiilling 7 people and wounding 1 person[8] Qusar is located in Eurasian continent, in the north-eastern inclination of the main Caucasus Mountain ridge.

Even in ancient times, the territory of the rayon took a good position on a junction of the main trade roads.

Extension of the borders in kilometres: Oak, peanut and hornbeam are often found in the forest areas.

[9] Natural herbs such as cranberry, sumac, hawthorn, wild grapes and blackberries are also grown in the forests.

[10] On the territory of the district, Qusar State Nature Sanctuary was established according to the resolution of the Council of Ministers of Azerbaijan SSR dated February 24, 1964, on an area of 15,000 hectares with the purpose of preserving and increasing the number of animals and birds (pheasant, quail, roe, wild boar, rabbit) inhabiting here.

[13] Lezgins constituted 2% of the total population of Azerbaijan in 2009 who commonly settled in Qusar district.

Agriculture of this region is based on two main fields – crop production and animal husbandry.

[24] Wheat, barley, corn, beans, potatoes, apples, pears, nuts, tomatoes and cabbage are the main crops grown in Qusar.

[25] Heroes of the Soviet Union: There is 1 city (Qusar), 1 settlement (Samur) and 88 villages in the district which has a territory of 1542 km2.

[9] Some of the villages are Anig, Laza, Uzdenoba, Gyunduzkala, Duztahir, Zindanmurug, Suvadzhal, Hiloba, Urva, Chilegir and Yukhary Leger.