Ghezel Ozan

The Ghezel Ozan ( / Qezel Owzan) is one of the longest rivers in Iran, originating from the Chehel Cheshmeh Mountains between Saqqez and Divandarreh in Kurdistan Province flowing in northern Iran.

It flows through Kurdistan Province, Zanjan Province, East Azerbaijan Province, Ardabil Province, and Gilan Province.

It is one of two tributaries forming the Sefid-Rud river, with the Shahrood. The Sefīd-Rūd is a major river and tributary of the Caspian Sea. Its catchment area is about 48600 km2.

Course
The Ghezel Ozan headwaters are in the Zagros Mountains, in a region near Divan Darreh in Kurdistan Province. It runs northeastwards through Miyaneh County in East Azarbaijan and then Khalkhal County in Ardabil Province and then Zanjan County and Tarom County in Zanjan Province eastwards through the Alborz mountain range in Gilan Province.

At Rudbar in the southwestern Alborz, the Ghezel Ozan joins the Shah Rud−Shahrood river to form the Sefīd-Rūd river (meaning White River in Persian). Then the Sefid-Rud flows northwards in Gilan Province, through the Alborz range to the Caspian Sea.

Nomenclature
Sometimes the Ghezel Ozan and the Sefīd-Rūd are considered a single river, and the words "Ghezel Ozan" and "Sefid-Rud" are used synonymously for the entire river that flows from the Zagros Mountains in Kordestan Province to the Caspian Sea.