The Tarim Basin is located in the Xinjiang Uygur Autonomous Region of far western China, centered roughly around 37°N latitude and 83°E longitude. It is the largest enclosed drainage basin in China, with its central desert alone stretching over 259,000 square kilometers (about 100,000 square miles). The basin sits between some of Asia’s most formidable mountain ranges, making it one of the most geographically isolated lowlands on Earth.
Mountain Ranges That Define the Basin
The Tarim Basin is essentially a giant bowl walled in by mountains on three sides. To the north, the Tian Shan range separates it from the grasslands of Central Asia. To the south, the Kunlun Mountains run east for roughly 2,880 kilometers from the Pamir Plateau, forming a barrier between the basin and the Tibetan Plateau. To the west, the Pamir Mountains and Karakoram range close off the remaining gap. Only the eastern end of the basin is relatively open, tapering toward the Gansu corridor and the Chinese interior.
These surrounding ranges are responsible for the basin’s extreme aridity. Moisture-laden air from every direction is blocked or stripped of rain before it can reach the basin floor, creating one of the most intense rain shadows on the planet.
The Taklamakan Desert at Its Core
Most of the Tarim Basin’s floor is occupied by the Taklamakan Desert, one of the driest and most barren expanses on Earth. About 85 percent of the Taklamakan consists of shifting sand dunes, some reaching 200 to 300 meters (650 to 900 feet) high. Only Saudi Arabia’s Rub’ al Khali has a larger continuous dune field. Parts of the basin floor receive no more than 10 millimeters of rain per year, and the mean annual precipitation across the basin as a whole is just 66 millimeters. The absolute driest station on record, Tazhong in the heart of the desert, averaged only 26.7 millimeters per year between 1999 and 2021.
With so little rainfall and almost no vegetation to anchor the sand, the Taklamakan is a prolific source of dust storms visible from space.
Rivers That Flow Inward, Not to the Sea
The Tarim Basin is endorheic, meaning none of its water ever reaches the ocean. Rivers fed by snowmelt and glaciers in the surrounding mountains flow inward toward the basin’s lowest point, where they end in seasonal lakes, swamps, or simply evaporate into the desert. The largest of these is the Tarim River, which collects water from the Tian Shan, Kunlun, Pamir, and Karakoram ranges. Other significant rivers include the Hotan, Keriya, and Qarqan, all of which are intermittent and typically flow only from June through September.
Because these rivers lack the energy to cut through the surrounding mountains, their water has nowhere to go. The historic terminus of several of these waterways was Lop Nor, a shifting lake in the basin’s eastern reaches that has largely dried up over the past century.
Silk Road Oasis Cities
Despite the harsh interior, a ring of oasis towns has existed along the basin’s edges for thousands of years, sustained by rivers flowing down from the mountains. These oases gave the Tarim Basin outsized historical importance as the crossroads of the Silk Road.
At Dunhuang, on the basin’s eastern approach, Silk Road travelers split into two main routes. The northern route hugged the foothills of the Tian Shan, passing through Turfan, Korla, Kucha, and Aksu before reaching Kashgar at the western end. The southern route followed the base of the Kunlun Mountains through oases like Miran, Cherchen, Niya, and Khotan before reconnecting at Kashgar. A third, intermediate route passed through the military garrison at Lou-lan on the shores of Lop Nor. Many of these stops were home to thriving Buddhist cave complexes, including Bezeklik near Turfan and the Kyzil caves near Kucha.
Modern Cities and Administration
Today the Tarim Basin falls entirely within Xinjiang, whose capital is Ürümqi, located just north of the Tian Shan and outside the basin itself. The major population centers within and around the basin are the same oasis cities that served Silk Road caravans: Kashgar (Kashi) in the far west, Aksu to the northwest, Korla on the northern rim, and Hotan and Yarkand along the southern edge. Yarkand sits at the junction of the old northern and southern Silk Road branches, watered by the Yarkand River. These cities remain the economic and administrative hubs for the basin’s population, which is predominantly Uyghur.
Efforts to Hold Back the Desert
Since the early 2000s, the Chinese government has invested heavily in desertification control around the Tarim Basin. The centerpiece is a “green barrier” project: a belt of vegetation strips and sand-stabilizing barriers encircling the Taklamakan, designed to limit sand movement and protect surrounding farmland and infrastructure. Recent satellite analysis suggests the Taklamakan has actually shrunk slightly over the past two decades as a result of these combined restoration efforts, though the desert remains vast and the basin’s water resources remain under severe pressure from evaporation and upstream agricultural demand.