The Qom River receives its water from the Zagros Mountain and the Namak Lake

Namak Lake

Namak Lake is a salt lake in Iran. It is located approximately east of the City of Qom at an elevation of above sea level. The lake has a surface area of about 1800 km², but most of this is dry. Water only covers 1 km². The lake only reaches a depth between 45 centimetres to 1 metre...

; It is a large river in Iran. The Qom flows through the city of Qom

Qom

Qom is a city in Iran. It lies by road southwest of Tehran and is the capital of Qom Province. At the 2006 census, its population was 957,496, in 241,827 families. It is situated on the banks of the Qom River....

, and together with the Qareh Su it gains a length of approximately 400 km (248.5 mi). The water level strongly fluctuates between 312 m³/s and only 4 m³/s. This is partially the effect of taking water for irrigation.