| Boyuk Kirs | |
| Elevation M: | 2725 |
| Coordinates: | 39.6475°N 46.7458°W |
| Map: | Caucasus mountains#Azerbaijan |
Mount Boyuk Kirs (Azerbaijani: Böyük Kirs dağı — Mount Big Kirs) is one of the highest peaks in the Karabakh Range of the Lesser Caucasus in Azerbaijan at an altitude of 2,725 metres above sea level.[1] Before the 2020 Nagorno-Karabakh War, it was the highest mountain of the breakaway Republic of Arstakh.[2] [3] It forms the border between the Khojavend and Shusha districts of Azerbaijan. The mountain is formed by volcanic rocks dating to the Middle Jurassic.[4]
The mount is named so as to distinguish it from the oronym Kichik Kirs. Kirs is used as a toponymic term meaning "swollen hill, steep mountain".
The mount is part of the geological Lachyn subzone, which is a narrow Jurassic rock with some Albian-Cenomanian transgressive mantle, over 70 km long, and 2-8 km wide. The subzone is traced from the interfluve of the Pichanis and the Shalva in the northeast, to the left bank of the Araz in the southeast.[5]