A remarkable satellite image has revealed an unusual Y-shaped landform hidden within China’s vast Taklamakan Desert. The striking feature appears where a winding river rich in gemstones meets a long rocky ridge deep in the Tarim Basin. In the same isolated region, the ruins of an ancient military fort linked to the Silk Road still overlook the desert sands.
The Taklamakan Desert, located in China’s Xinjiang region, is one of the largest sand deserts in the world. Spanning roughly 130,000 square miles (337,000 square kilometers), the desert has long been known for its extreme climate. Temperatures can soar during the summer, while rainfall remains scarce throughout the year. Because of these harsh conditions, scientists once described the interior of the desert as a “biological void,” a place where very little life could survive.
In recent decades, however, the region’s environmental story has begun to shift. Beginning in 1974, China launched a massive ecological project to slow the spread of desertification. As part of this effort, more than 66 billion trees have been planted along the desert’s northern boundary. The expanding forest belt, often referred to as the Great Green Wall, is designed to stabilize the soil and absorb carbon dioxide. Researchers say the project is gradually helping reduce the movement of sand while creating a growing carbon sink.
A river carrying jade through the Taklamakan Desert in China
The Y-shaped formation visible from space is created by two major natural features. One branch traces the path of the Hotan River, which runs for about 180 miles (290 kilometers) across the desert. The river begins in the glaciers of the Kunlun Mountains, where melting ice feeds the water that eventually flows north through the barren basin.
Satellite images frequently show the river as a green ribbon cutting across the sand. Vegetation grows along its braided channels, forming thin strips of plant life in an otherwise dry landscape.
The Hotan River is also known for the gemstones carried in its waters. The river transports white and green nephrite, both forms of jade that have been treasured in Chinese culture for thousands of years. Historically, travelers and traders searched the riverbed for these valuable stones, which were later shaped into jewelry, ceremonial objects, and decorative art.
Rocky Ridge and Ancient Fortress Mark Historic Crossroads
The second branch of the formation follows the Marzatagh ridge, a long rocky structure rising about 600 feet (180 meters) above the surrounding desert. Stretching nearly 90 miles (145 kilometers) toward the northwest, the ridge is composed of iron-rich red rock and pale sandstone layers. Because of its contrasting colors, local communities refer to the formation as Hongbaishan, meaning “red-white mountain.”
The ridge also plays an important role in shaping the desert landscape. It acts as a barrier to strong winds, causing drifting sand to accumulate along its edge. This process forms crescent-shaped dunes known as barchan dunes across parts of the basin.
At the point where the river and ridge meet stand the remains of Mazar Tagh, an ancient fortress built during the rule of the Tibetan Empire between A.D. 618 and 842. The fort once served as a strategic outpost overseeing Silk Road routes that crossed the Tarim Basin.
Archaeological excavations began in 1907 when explorer Aurel Stein uncovered more than 1,500 fragments of documents written on wood and paper. Scholars later identified several languages in the texts, including Khotanese, Uyghur, and Sogdian. The writings describe daily life for soldiers stationed at the remote desert post.
Other discoveries included arrows, shoes, dice, a comb, and writing tools, many now preserved in the British Museum. Among the most unusual finds was a painted image of a begging monk on a wooden panel, believed to have been created by one of the soldiers.
Historians believe the monk may have been traveling to a Buddhist shrine that once stood on the hill. Today, the location hosts an Islamic shrine, reflecting centuries of cultural and religious change in the region.