Euphrates

Overview

The Euphrates is Western Asia’s longest river, extending about 2,700 kilometers from northeastern Turkey through Syria and Iraq. It flows south into northern Syria, turns southeast across the country and enters Iraq, where it joins the Tigris. Their combined waters reach the Persian Gulf through the Shaṭṭ al-Arab. Along its course, the river has supplied water for farms and cities, connected settlements across otherwise arid terrain and marked political and military frontiers.

With the Tigris, the Euphrates gave Mesopotamia its name: the land between the rivers. Its waters sustained ancient irrigation networks and cities including Mari and Babylon. The river also has a prominent place in the Hebrew Bible. Genesis names it among the rivers associated with Eden, while Genesis, Deuteronomy and Joshua identify it as the northern boundary of the ideal land promised to Israel. In modern Syria, control of its crossings, dams and banks has shaped campaigns against the Islamic State and confrontations among Turkish, Kurdish, Syrian and American-backed forces.

Geography

The Euphrates rises in northeastern Turkey and passes into Syria before continuing through Iraq. In Syria, it passes the area of Lake Assad and the Euphrates Dam, runs near Raqqa on its north bank and crosses Deir ez-Zor governorate on its way toward the Iraqi border. Farther south, the Euphrates and Tigris shape Iraq’s fertile plains. Basra stands near their lower confluence and the Shaṭṭ al-Arab outlet. Pollution and reduced river flows have harmed the city’s water supply.

The Syrian valley between Lake Assad and Abu Kamal receives less than ten inches of rain in a typical year. Farming there therefore depends on irrigation rather than rainfall. The river supplies fields, towns and power generation, while bridges and dams provide scarce routes across it. Thawra Dam was especially important during the campaign for Raqqa: it supplied irrigation water and electricity and was the only intact crossing on the stretch of the river then held by the Islamic State. In Deir ez-Zor governorate, the river also separated principal zones of military control during successive phases of the Syrian civil war.

Upstream water decisions affect communities far beyond Turkey. Turkish dams have cut the Euphrates’ flow by half, giving Ankara leverage over supplies to northern Syria and deepening shortages downstream. Drought brought the Syrian Euphrates to levels unseen since the 1950s. Iraq has faced pressure as well: reduced Tigris and Euphrates flows associated with Turkey’s Ilisu Dam added to Basra’s water problems. These pressures interact with local pumping, irrigation policy and damaged infrastructure, making river management a matter of regional stability.

Ancient and biblical history

Limited rainfall made water from the Euphrates and Tigris essential to agriculture in ancient Mesopotamia. An extensive network of canals carried river water into fields, supporting some of Iraq’s earliest civilizations. Cities on or near the Euphrates included Carchemish, Mari, Babylon, Erech and Ur. Ancient Babylonia occupied land between the two rivers, approximately within modern Iraq. The river served both as a source of food production and as an artery for travel, exchange and political power.

Mari stood at Tell Hariri near the Euphrates, north of the present Syrian–Iraqi border. Its position on a river route beside the desert shaped its contacts, fortunes and character. Mari became one of Mesopotamia’s principal centers during the third and early second millennia BCE. Its ruler Yahdun-Lim established dominance over the Middle Euphrates region, while texts from Mari in the third millennium BCE treated the river as a deity. The city’s written records also preserve evidence of the language and society of the ancient Near East.

The Euphrates remained a frontier under later empires. By 120 BCE, Mithridates II had established Parthian rule along its frontier. In 38 BCE, Parthian forces withdrew across the river after their general Pacorus was killed. Such episodes reflect the river’s enduring value as a line of movement and defense, even as control of the surrounding land changed.

The river’s Hebrew name is Perat; its ancient Akkadian and Sumerian names are Purattu and Buranun. Genesis 2:14 names the Euphrates among four rivers associated with Eden. Although the Tigris and Euphrates are identifiable, Eden’s location and the identification of all four rivers remain unresolved. Biblical texts also call the Euphrates “The River” and “The Great River.” Genesis, Deuteronomy and Joshua place it at the northern boundary of the ideal land promised to Israel, giving the river a lasting place in Jewish accounts of the land’s geography.

Jewish history

The Euphrates appears in biblical accounts of both Israel’s promised boundaries and Babylon’s fate. In Jeremiah, Seraiah is instructed to bind a stone to a scroll and cast it into the river as a sign of Babylon’s impending destruction. The image uses a familiar and powerful waterway to express the fall of a major empire. The river also connected the lands of ancient Israel to Babylonia, which became a major center of Jewish life.

Babylonian Jewry lived within the wider Mesopotamian world shaped by the Tigris and Euphrates. During Rome’s war against the Jews, Josephus addressed Jews across the Euphrates, reflecting the river’s place in the geography of dispersed Jewish communities. The records from Mari, although centuries older than the Hebrew Bible and without a demonstrable direct connection to the history of ancient Israel, preserve linguistic, cultural and social evidence useful for studying the ancient setting in which biblical traditions emerged.

Modern history

Modern development made the Syrian Euphrates Valley heavily dependent on state irrigation decisions. Syria’s 2004 agricultural census recorded 43 percent of Deir ez-Zor province’s population working in agriculture, compared with a national average of 20 percent. In Raqqa province, the share was 46 percent. The combined population of Deir ez-Zor and Raqqa provinces grew from about 400,000 in 1960 to 2 million in 2010, reducing average farm size. Oil production along the valley created few jobs for residents under the Syrian regime, leaving many households dependent on land and water.

The regime failed to extend irrigated farmland far beyond the Euphrates Valley because funding and water were insufficient. Failed expansion and growing shortages encouraged illegal wells and pumping. These pressures damaged the long-term prospects of farming and contributed to local discontent before protests began in 2011. During the Syrian civil war, destruction of about half the country’s water infrastructure compounded shortages linked to drought and declining Euphrates flow. The water crisis arose from several connected causes: failed regime policy, population pressure, drought, wartime damage and reduced water arriving from upstream.

The river’s modern strategic importance extends beyond farming. In 2007, Mossad accessed the computer of Syrian nuclear official Ibrahim Othman and found photographs of a secret reactor under construction beside the Euphrates. The photographs showed that the Al Kibar facility closely matched North Korea’s Yongbyon plutonium reactor. The episode placed a site on the river within Israel’s security concerns, alongside the more persistent issues of Syrian instability and the movement of Iran-aligned forces through eastern Syria.

Security

During the Syrian civil war, the Islamic State held Arab tribal communities in the Euphrates Valley and used territory west of the river near Turkey as a corridor. It moved fighters and weapons into Syria and petroleum products into Turkey through border routes around Jarabulus. In June 2015, Turkey identified a move west of the Euphrates by the Kurdish Democratic Union Party as a trigger for stronger military action. The river consequently became a boundary in Turkey’s effort to prevent Kurdish-held areas east of it from connecting with Afrin to the west.

Turkey launched Operation Euphrates Shield in August 2016 to remove the Islamic State from its border and prevent Kurdish forces from consolidating further territory west of the Euphrates. Turkish troops and allied Syrian rebels captured Jarabulus from the Islamic State on August 24. By March 2017, the operation had established a Turkish-influenced zone west of the river separating Kurdish-held areas to its east and west. Syrian government forces also captured Deir Hafer in 2017, on the route from al-Bab toward Lake Assad and the Euphrates Dam. These movements made control of roads, crossings and river approaches central to the competing campaigns.

On November 6, 2016, the U.S.-backed Syrian Democratic Forces (SDF) launched Operation Euphrates Wrath to take Raqqa from the Islamic State. Coalition airstrikes destroyed Raqqa’s two Euphrates bridges on February 3, 2017, as the SDF worked to isolate the city. Control of Thawra Dam mattered because its crossing remained intact and its facilities supplied water and electricity. The SDF eventually took Raqqa and other areas east of the Euphrates from the Islamic State. In 2018, movement of SDF fighters from the lower valley to Afrin slowed their campaign against remaining Islamic State forces.

Farther downstream, the race for Deir ez-Zor brought rival forces toward the same river corridor. The SDF approached from the northeast with American support. Russian-backed Syrian forces and Shia militias, including the terrorist organization Hezbollah, approached from the west. In September 2017, coalition forces supplied equipment, training, intelligence and logistics for the SDF’s Island Storm offensive toward the Euphrates near Deir ez-Zor. Oil and gas fields on the east bank were strategic objectives for the SDF because their revenue could fund reconstruction.

Syrian government forces crossed to the east bank using a Russian pontoon bridge and amphibious vehicles. Syria’s 5th Corps took part; its members had received training and organization from Iran’s Islamic Revolutionary Guard Corps and Russia. The crossing complicated attempts to use the river as a line between the American-backed and Russian-backed campaigns. Deir ez-Zor governorate was also the main bridge for Iranian militias moving between Iraq and Syria along the Euphrates, adding to the corridor’s importance for Israel’s security.

On December 7, 2017, Syrian forces declared their campaign against the Islamic State complete in the Euphrates Valley between al-Mayadeen and Albukamal. Islamic State fighters nevertheless continued attacks from desert areas on both sides of the river. A committee involving Russian forces, Kurdish forces and local Arab tribes began work on governance east of the Euphrates that December. After the Islamic State’s territorial defeat in the valley, its leader Abu Bakr al-Baghdadi made a rare video appearance in April 2019. The end of its control over major settlements had not ended the security threat posed by its remaining fighters.

Present day

Following its role in defeating the Islamic State, the SDF controlled roughly 30 percent of Syria, chiefly east of the Euphrates. The river formed a natural barrier between most SDF territory and Syrian government-controlled areas, although the SDF also held a handful of positions west of it. In 2024, several hundred American troops supported operations against Islamic State remnants in the broad area held by the SDF east of the river. A U.S. outpost near Conico stood east of Deir ez-Zor city and the Euphrates in December 2023, illustrating the continued American presence along the corridor.

In January 2026, the government of Ahmed al-Sharaa advanced against the SDF through contested territory west of the Euphrates, including Deir Hafer and Maskanah. Defections and withdrawals by Arab fighters accelerated the SDF’s collapse west of the river. Syrian government forces took Tabqa in Raqqa province, gaining a position from which to advance toward Raqqa. Most SDF-held territory remained east of the Euphrates, within the U.S. military’s area of operations. The river again served as a boundary between forces, even as events showed that such boundaries could change quickly.

Water remains as consequential as military control. Turkish dams, drought, failed irrigation policy and wartime damage have reduced reliable supplies for Syrian farms and communities. Persistent scarcity risks further local unrest and gives Iran’s regime opportunities to deepen its influence in Syria, with consequences for Israel’s security. Israeli assistance with water provision, infrastructure or financing could help address the crisis and strengthen regional ties. The Euphrates therefore remains both a life-sustaining river and a strategic corridor whose management affects the stability of Syria and its neighbors.