• Nakhchivan economic-geographical region
• Sadarak region

The archeological monuments found in Sadarak region is related to IV millenium B.C. The ancient findings of eneolit, bronze, antic and medieval periods and historical monuments (City place, Aghoghlan sacred place, Sadarak tower and etc) discovered in the region prove that Sadarak region was one of the ancient and long term residential and cultural center of the Republic. The territory was the part of Iravan province of Sadarak region part of Ottoman Empire in XVIII century.
The region was established in 1990 with the administrative center of Heydarabad named in honor of 75th anniversary of National Leader of Azerbaijan Heydar Aliyev.
There are different opinions about the etymology of the word Sadarak. According to some researchers, Sadarak means “three valleys” in Persian referring to Chanagchichay, Jahannamdara and Baghirsag valleys. According to the other sources the word comes from “sed colour” that means hundreds of colours in Persian language. Considering certain specialists’ opinion the word “sadar” comes from the Arabian language and means “a camp”.
Relief: The surface is mountainous in the Northern and Eastern parts while inclined plains (Sadarak plain) dominate in Arazboyu plains.
Geological structure: Devan sediments in mountainous areas and Cretaceous sediments in plain areas form the geological structure of the region.
Rivers anil water basins: Gara- chay, Chapan and Araz rivers flow across the region.
Landscapes and biodiversity: The area displaces dry continental climate. Gray soil is prevailing in the territory. As because the underground waters are close to surfac, gray meaodw and grassland, water marsh, sand and salt desert and semi desert, mountain xerophytes (frigana), mountain steppe plants in low mountainous zone became characteristic plants of the region. The endemic and unique plants of the region are Iris (Iris elegantissima), side’s mealybug (Camphorosma lessingii), phog (Calligonum polygonoides), rhubarb (Rheum ribes), squirting cucumber (Ecballium elaterium), buchingera (Asperuginoides saxillaris), Jujube fruit (Ziziphus jujuba) and etc.
The fauna of the region is mainly represented by wolf (Canis lupus), jackal (Canis aureus), red fox (Vulpes vulpes), bezoar goat (Capra aegagrus), Cyprian wild sheep (Ovis orientalis), Wild boar (Sus scrofa), Brown hare (Lepus europaeus), Field mouse (Columba livia), different scorpions (Androctonus crassicauda, A.australis) and solpuga species (Rhagodes caucasicus, Gluviopsis nigrocinctus), Chukar Partridge (Alectoris chukar), Upcher’s Warbler (Hippolais languida, Common Starling (Sturnus vulgaris), Rock pigeon (Columba livia) and etc.

Geological nature monuments: A spring in Bulagbashi village. Sadarak mineral water supply in Garaburun area near Sadarak village. Ajdaha cave near Sadarak village with the length of 12 meters and the width of 5 meters.

Archeological monuments: Fortress city-Sadarak Tower referring to Bronze and Iron Ages near Sadarak village. The fortress has a Cyclopes defence wall with 2 meters height and 2.5 meters width. There is an entrance of 5 meters width in the South Western part of the wall. A residence of Eneolit Period near Sadarak village: city palace. “Aghatli oghlan” sacred place related the middle ages in the slopes of Ujubiz Mountain. There is an ancient residence dated VII-XI centuries around sacred place.
Historical and cultural monuments: A mosque (XVIII century) in Sadarak village. A medieval fortress- Koroghlu fortress. A residence- Ajdaha cave of III-VIII centuries near Sadarak village are the monuments of the region.