Haffar in the context of "Arvand Rud"

The Karun (Persian: کارون, IPA: [kɒːˈɾuːn]), the Ancient Greek Eulaeus (Greek: Εὔλαιος or Εὐλαῖος, Hebrew Ulai (Hebrew: אולי), is the Iranian river with the highest water flow, and the country's only navigable river. It is 950 km (590 mi) long. The Karun rises in the Zard Kuh mountains of the Bakhtiari district in the Zagros Range, receiving many tributaries, such as the Dez and the Kuhrang. It passes through the city of Ahvaz, the capital of the Khuzestan Province of Iran, before emptying to its mouth into Arvand Rud.

The Karun continues toward the Persian Gulf, forking into two primary branches on its delta – the Bahmanshir and the Haffar – that join the Arvand Rud, emptying into the Persian Gulf. The important Island of Abadan is located between these two branches of the Karun. The port city of Khorramshahr is divided from the Island of Abadan by the Haffar branch.

The Bahmanshir channel (Persian: بهمن‌شیر, IPA: [bæhmænˈʃiːɾ]) is a secondary estuary of the Karun River that parallels the Shatt al-Arab/Arvand Rud waterway on the far side of the Abadan Island, Iran, for 70 miles before emptying into the Persian Gulf.

The Bahamanshir served as the main estuary of the Karun River before the digging of the Haffar canal, by the Daylamite Buwayhid king Panah Khusraw Adud ad-Dawlah, that joined the Karun to the Arvand Rud / Shatt al-Arab waterway at the site of the present-day Khorramshahr. The Haffar in time became the main estuary of the Karun, relegating the Bahmanshir to a secondary estuary status.

Khorramshahr (Persian: خرمشهر; [xoræmˈʃæhɾ]) is a city in the Central District of Khorramshahr County, Khuzestan province, Iran, serving as capital of both the county and the district. It is also known in Arabic by the local ethnically Arab population as Al-Muhammarah (Arabic: المحمرة).

Khorramshahr is an inland port city located approximately 10 kilometres (6.2 mi) north of Abadan. The city extends to the right bank of the Shatt Al Arab waterway near its confluence with the Haffar arm of the Karun river. The city was destroyed in the Iran–Iraq War, with the 1986 census recording a population of zero. Khorramshahr was rebuilt after the war, and more recent censuses show that the population has returned to the pre-war level.