For thousands of years, the Euphrates has been one of the most important rivers in human history. It helped support some of the world’s earliest civilizations and became a defining feature of ancient Mesopotamia. Now, new research suggests the river’s origins were far more complex than previously thought. Scientists have found evidence that the Euphrates began as two separate river systems that later merged to form the river known today.
The study, led by Andrew S. Madof and published in Nature Geoscience, traces the river’s evolution over millions of years. Researchers say the findings reveal how tectonic forces, climate shifts and dramatic changes in the Mediterranean region helped shape one of Western Asia’s most important waterways.
Two ancient rivers shaped the landscape
Researchers identified two large prehistoric rivers that they call the Palaeo-Karasu and Palaeo-Murat. These rivers flowed separately across what is now eastern Turkey during the Late Miocene period, more than 5 million years ago.
Using geological mapping, seismic data and computer modeling, the team linked these ancient rivers to large sediment deposits buried beneath parts of the eastern Mediterranean. The evidence suggests both rivers once flowed southwest toward the Mediterranean rather than southeast toward the Persian Gulf as the modern Euphrates does today.
The researchers found that the Palaeo-Karasu stretched for more than 1,370 kilometers (851 miles), while the Palaeo-Murat extended for nearly 2,000 kilometers (1243 miles). At that time, the rivers ran roughly parallel to each other and drained large areas of Anatolia.
Mediterranean crisis altered river systems
A key turning point came during the Messinian salinity crisis between about 5.97 and 5.33 million years ago. During this period, connections between the Atlantic Ocean and the Mediterranean Sea became restricted, causing large parts of the Mediterranean basin to dry out.
Scientists reveal the origin of the Euphrates — a river that fed the 'cradle of civilization' pic.twitter.com/9c5poQIpAp
— Vijimon Oorkolil (@AbdulR13838) June 2, 2026
Researchers believe this dramatic event lowered sea levels and forced rivers across the region to cut deeper into the landscape. The Palaeo-Karasu and Palaeo-Murat responded by carrying huge amounts of water and sediment toward the partially dried Mediterranean.
The study suggests that these ancient rivers deposited massive sediment accumulations known as the Handere and Nahr Menashe formations. Scientists say the scale of these deposits points to powerful river systems capable of transporting large volumes of sediment across long distances.
Faults and uplift redirected the rivers
The research indicates that tectonic activity gradually changed the rivers’ paths. Fault movement and uplift across eastern Anatolia altered the landscape and repeatedly redirected water flow.
The first major diversion occurred when the Palaeo-Murat shifted eastward. Later, the Palaeo-Karasu also changed course and joined it. These changes eventually created an early version of the Euphrates River. Additional landscape adjustments continued for millions of years before the modern river finally emerged.
According to the researchers, the modern Euphrates likely reached its current form about 1.6 million years ago. By then, the two ancient river systems had merged into a single river flowing toward the Persian Gulf.
Ancient neighbors: the Euphrates and Nile
One of the study’s most surprising findings concerns the relationship between the ancestral Euphrates and the Nile.
The researchers reconstructed the eastern Mediterranean landscape as it appeared around 5.35 million years ago. Their model suggests the ancestral Euphrates and ancestral Nile may have been separated by less than 25 kilometers (15.5 miles) at one point. If correct, this would represent the closest known distance between the two major river systems in Earth’s history.
The reconstruction also depicts a dramatically different Mediterranean region. Areas that are now underwater may have been exposed drylands, while wetlands and lakes existed across parts of Anatolia.
A new view of a historic river
The researchers conclude that the Euphrates did not emerge as a single river. Instead, it evolved through a long series of geological events involving two separate rivers, shifting tectonic plates and major environmental changes.
The findings provide new insight into the natural history of a river that later became central to human civilization. By reconstructing the Euphrates’ deep past, the study offers a clearer picture of how geological forces shaped the landscapes that would eventually support some of the world’s earliest cities and societies.
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