Deir ez-Zor

Overview

Deir ez-Zor is a city on the Euphrates in eastern Syria. Deir ez-Zor Governorate, the surrounding province, extends well beyond the city along the river and toward the Iraqi border. The distinction matters: fighting in the city, control of the governorate’s oil fields, and attacks on positions in its countryside involved different places and, at times, different authorities. The governorate is predominantly inhabited by Arabs. Its agricultural communities, energy resources, and cross-border routes made it important before the Syrian civil war and central to several phases of that war.

Deir ez-Zor also has a place in the history of the Armenian genocide: Armenians deported from the Ottoman Empire were sent toward the Deir ez-Zor area in 1915. In 2007, Israel destroyed a Syrian nuclear reactor near Deir ez-Zor. During the civil war, the region became a battleground among Syrian regime forces, rebel groups, the terrorist organization Islamic State, the U.S.-backed Syrian Democratic Forces (SDF), and armed groups backed by the Iranian regime. These episodes concern the same geographic area but belong to distinct periods of its history.

Geography

The Euphrates runs through Deir ez-Zor Governorate and provides the principal geographic reference for its settlements, farmland, oil and gas facilities, and military positions. During much of the later civil war, the river separated SDF-held territory on its eastern bank from positions held by the Assad regime and Iranian-backed forces on its western bank. The SDF-held side included most of Syria’s oil and gas resources. Deir ez-Zor city and the wider governorate therefore had different strategic roles: the city was an urban and military objective, while control of the countryside determined access to fields, border routes, and communities along the river.

Agriculture remained significant alongside energy production. 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. The combined population of Deir ez-Zor and neighboring Raqqa provinces rose from about 400,000 in 1960 to 2 million in 2010, reducing average farm size. These figures describe two provinces together and do not give a population for Deir ez-Zor city. They show the pressure that demographic growth placed on farming households in a region later affected by prolonged warfare and changes in control of its land and infrastructure.

Roads through the region connect the Euphrates corridor to central Syria and to Iraq. Retaking Palmyra gave the Syrian Army control of a crossroads linking Deir ez-Zor and Raqqa with Homs and Damascus. Farther east, the Albukamal area became important to Iranian-backed forces moving between Iraq and Syria. Oil fields, gas installations, roads, and the river crossings were thus closely connected military objectives. The Conico gas field, east of Deir ez-Zor city and the Euphrates, later hosted a U.S. position.

Modern history

Deir ez-Zor was a destination for Armenians deported during the Armenian genocide of 1915. Its name is consequently associated with the forced movement of Armenians into the Syrian desert under Ottoman rule. The city’s later history unfolded under Syrian state administration, but the governorate’s river valley and routes to Iraq continued to give it importance beyond its urban population. In 2007, Israel destroyed a Syrian nuclear reactor in the Deir ez-Zor area. The Islamic State later controlled the reactor site after gaining territory in Syria and Iraq. In September 2025, after uranium particles were found at a Syrian site linked to the destroyed facility, Syrian leader Ahmed al-Sharaa pledged cooperation with the International Atomic Energy Agency.

Deir ez-Zor entered the Syrian civil war amid unrest in 2011. Clashes between Syrian Army personnel and regime security forces were reported in Deir ez-Zor as well as Jisr al-Shughour, Homs, and Abu Kamal. As the conflict spread, armed opposition groups and jihadist organizations contested the governorate’s energy installations. The Assad regime regained the Al-Omar oil field in early 2013, then lost it later that year. In November 2013, the Al-Nusra Front and the Islamic State in Iraq and al-Sham also fought over a gas production plant in the governorate. Control of energy facilities brought revenue and influence, making those sites more than incidental prizes in the fighting.

On November 23, 2013, Free Syrian Army fighters and operatives of the Al-Nusra Front, Al-Qaeda’s branch in Syria, captured Al-Omar after several days of fighting. Al-Omar was identified at the time as Syria’s largest oil field. Its capture formed part of a broader shift in which rebel coalitions took many oil and gas fields in eastern and northern Syria, sometimes operating alongside local tribes. The takeover further damaged Syria’s oil infrastructure during the war. Later control of the governorate’s energy resources remained consequential: fields on the east bank strengthened the income of the Autonomous Administration of Northeast Syria under SDF protection.

The Islamic State subsequently controlled much of the Deir ez-Zor region and besieged Syrian regime positions in the city. Its rule affected both military access and civilian life. In September 2017, as rival forces advanced, the organization ordered residents to leave neighborhoods it still controlled in Deir ez-Zor and declared those neighborhoods military zones. The battle to end its control unfolded on two fronts. Russian-backed Syrian forces and Shia militias, including the terrorist organization Hezbollah, approached from the west and south. U.S.-backed SDF forces approached from the northeast and north. Both campaigns targeted the Islamic State, while their sponsors and local allies sought influence over the territory that would follow its defeat.

The SDF had begun preparing its advance earlier in 2017. In February, it launched a phase of operations intended to sever the Islamic State’s connections between Raqqa and Deir ez-Zor while moving from the north and west. Before its Deir ez-Zor military campaign, the SDF formed a civil council to administer local affairs. The United States pressed the force to advance into both Raqqa and Deir ez-Zor during the campaign against the Islamic State. Coalition aircraft carried out 17 strikes in eastern Syria on July 27, 2017, including strikes around those two areas. When the SDF launched its Island Storm offensive toward the Euphrates in September, coalition forces supplied equipment, training, intelligence, and logistical support.

In September 2017, Syrian regime forces advanced toward Deir ez-Zor from the south as SDF forces advanced from the north. Regime forces breached the siege of the city’s military airport, reached its facilities, and worked with their allies to restore operations there. The Syrian army reopened the road connecting Deir ez-Zor to Damascus and captured the Al-Taym oil field south of the city. Russian air support included cruise missile attacks on Islamic State targets. On September 26, Russian bombers also launched cruise missiles at Islamic State and Hayat Tahrir al-Sham targets in Deir ez-Zor and Idlib provinces. Late that month, Islamic State forces attacked Syrian convoys and outposts in an effort to cut the logistical route between Deir ez-Zor and Palmyra.

The campaigns changed control across the governorate without ending its divisions. From 2017 to 2019, the SDF took the eastern bank of Deir ez-Zor from the Islamic State with support from local Arab partners, including Ahmad al-Khubayl, known as Abu Khawla. The SDF had appointed him head of the Deir ez-Zor Military Council in 2016. He came from the Bakir clan and helped the force operate in an Arab province where locally rooted partners were essential to recruitment and administration. On the other side of the Euphrates, Assad regime forces and Iranian-backed militias retained positions. In January 2020, SDF and coalition troops apprehended 16 Islamic State operatives in Deir ez-Zor Province, illustrating the continuing security threat after the organization lost territorial control there.

The danger to civilians and religious communities also continued. On November 11, 2019, Islamic State members killed two Armenian Catholic priests and wounded a deacon traveling from Hasakah to Deir ez-Zor. In another public-health crisis, a cholera outbreak that began in Deir ez-Zor in early September spread to Hasakah and Raqqa. These events were separate from the major territorial campaigns, but both show how insecurity and disrupted services persisted across the Euphrates region.

Security

Deir ez-Zor became a principal bridge for Iranian-backed militias moving between Iraq and Syria along the Euphrates. In 2017, pro-Assad forces backed by Iran sought to expand around the city and secure positions along the Syrian–Iraqi border. Iran also launched six surface-to-surface missiles at an Islamic State target in the Deir ez-Zor region that year. Control of the corridor had wider significance for Iran’s ability to move personnel and weapons through eastern Syria. Militias established influence from Albukamal toward Deir ez-Zor and westward toward the Palmyra area. Their positions placed them near routes used by U.S.-backed forces on the opposite side of the Euphrates.

Maher al-Assad’s Fourth Division and militias backed by the Iranian regime established a headquarters in Deir ez-Zor known locally as the “Hajj Fadel hostel.” It received military delegations from Iran, Lebanon, and Iraq. Brigadier General Abdul Karim Hamada served as the Fourth Division official responsible for the governorate. Iranian-backed formations also held positions farther east: Liwa Zainabiyoun was stationed with Liwa Fatemiyoun near central Albukamal. Air raids targeted Liwa Zainabiyoun on the Al-Hamdan Airport road and on Al-Haggana Street in the town. A 2023 survey counted seven Iranian military bases and 70 other Iranian military points in Deir ez-Zor, indicating the scale of that network at the time of the survey.

U.S. positions east of the river were also drawn into the confrontation. In November 2023, an Iran-aligned armed group announced an attack on the U.S. base at the Conico gas field in the Deir ez-Zor countryside. A U.S. outpost near Conico stood east of the city and the Euphrates in December 2023; Iranian-backed militias operated largely west of the river near Deir ez-Zor, while U.S. forces worked with the SDF on the eastern side. Attacks on these positions reflected the governorate’s role in a conflict extending beyond the campaign against the Islamic State.

SDF rule on the east bank depended on cooperation with local Arab communities, but grievances over services and local autonomy developed under the Kurdish-linked authorities. Residents and participants in the later uprising raised such concerns before the escalation. The SDF’s arrest of Abu Khawla, its local military council commander, triggered clashes with Arab tribes in late August 2023. He had been accused of drug trafficking, abuse of his position, and failures in the fight against Islamic State cells. The fighting killed dozens of people. Local grievances were a genuine cause of unrest; the Assad regime and Iranian-backed groups also sought to exploit it to weaken SDF control and push U.S. forces out of eastern Syria.

Iran-backed militias strengthened Sheikh Ibrahim al-Hafl and the Adiqat tribes in their challenge to the SDF. The confrontation therefore joined disputes over local governance to the wider struggle for the east bank and its energy resources. It did not end with the first wave of tribal fighting. On August 14, 2025, Arab tribal fighters clashed with SDF personnel in Gharanij in eastern Deir ez-Zor. Tribal fighters abducted six SDF soldiers and seized a military vehicle. Members of the Al Naim, Al Bushaaban, Qais Aylan, and Al Baqara tribes subsequently called for general mobilization against the SDF in Deir ez-Zor, Raqqa, and Hasakah. These incidents showed that tensions over armed authority and local representation remained active.

Present day

The fall of the Assad regime in December 2024 altered the political setting in which Deir ez-Zor’s divisions had formed. Anti-Assad fighters entered Deir ez-Zor during the offensive that ended the family’s rule. An integration framework later expanded Damascus’s control over areas formerly held by the SDF in Deir ez-Zor and Raqqa. Those changes followed years in which the Euphrates had marked a division between the SDF and U.S. presence on the east bank and Assad regime and Iranian-backed positions on the west. The city, governorate, and oil-producing countryside remain distinct when describing these changes: an agreement affecting territory across the governorate does not describe a single event confined to the city.

Deir ez-Zor’s importance rests on several connected features. Its Euphrates location links farms and settlements; its oil and gas fields have financed authorities and attracted rival armed groups; and its routes toward Iraq have enabled military movement across the border. The region’s recent history also includes the Armenian genocide, Israel’s destruction of the Syrian reactor, Islamic State rule and siege, the two-front campaign of 2017, and recurrent conflict over local Arab governance. Together, these episodes explain why control of Deir ez-Zor has repeatedly carried consequences beyond eastern Syria.