| Trans-Alay Range | |
| Other Name: | Tajik: қаторкӯҳи Паси Олой Kirghiz; Kyrgyz: Чоң Алай кырка тоосу Russian: Заалайский хребет |
| Photo Size: | 250 |
| Country: | Kyrgyzstan, Tajikistan |
| Region: | Osh Province, Gorno-Badakshan |
| Highest: | Ibn Sina/Lenin Peak |
| Elevation M: | 7134 |
| Length Km: | 250 |
| Length Orientation: | E-W |
| Width Km: | 40 |
| Width Orientation: | N-S |
| Geology: | Limestone and schist |
| Period: | Paleozoic and Mesozoic |
| Coordinates: | 39.3333°N 72.9167°W |
| Map: | Tajikistan |
| Label Position: | none |
| Language: | en |
The Trans-Alay or Trans-Alai Range (Kirghiz; Kyrgyz: Чоң Алай кырка тоосу, ; Tajik: қаторкӯҳи Паси Олой,, or Tajik: қаторкӯҳи Каюмарс, Tajik: qatorkŭhi Kayumars; Russian: Заалайский хребет,) is the northernmost range of the Pamir Mountain System. Following the collapse of the Soviet Union, the range has been divided between Tajikistan and Kyrgyzstan.
The Trans-Alay is located in the area where the Pamirs and the Tian Shan come together. This heavily glaciated range forms the border between the Gorno-Badakshan region in Tajikistan and the Osh Region, Kyrgyzstan, stretching eastwards until the border with China. The name was from the viewpoint of Russian explorers in the region: The Alay Range lies to the north of the Alay Valley, formed by the Kyzyl-Suu or upper Vakhsh River, one of the principal tributaries of the Amu Darya. The range on the far side of the valley, more distant from Russia and its outposts, became known as the Trans-Alay. The southern valley dividing the Trans-Alay from the Pamir proper is that of the river Muksu.
The highest peak in the range is the 7134 m high Ibn Sina/Lenin Peak.[1] The Kyzylart and Ters-Agar mountain passes geographically divide the range into three parts: the western —highest peak (5,900 m), the central —with some of the highest summits, including Lenin Peak, (6717 m), (6780 m), and Marshal Zhukov Peak (6842 m),[2] and the eastern — highest peak Kurumdy I summit (6614 m).[3]