evidence: The Pamirs are the most famous mountain convergence zone in the world. It is the largest mountain convergence zone that was formed by the convergence of the Tianshan Mountains, the Kalakunlun Mountains, the Himalayas, the Hindu Kush Mountains and the Jierter-Sulaiman Mountains. It lies in the hinterland of Eurasia and extends across China, Tajikistan and Afghanistan with an area of more than 100,000 km2. The Pamir Mountains were created by crustal tectonics. About 60 million to 20 million years ago, the Indian continental plate subducted under the Eurasian plate and, with the effects of extrusion and uplift of the Indian plate, several huge mountains were formed. They spread from the south to the north of the Qinghai-Tibetan Plateau and converged on the Pamirs. These mountains now radiate from the Pamirs and most of them are more than 4,000 m in height. Because of this, the Pamir Mountains are known as 'The Roof of the World'. There are suture lines resulting from the collision between the Indian and Eurasian plates, which occurred at the closure of the Paleo-Tethys period. The area is also an important tectonic transition zone and several tectonic boundaries converge in this area.