The water resources can be divided into two categories: subsurface and surface waters. The subsurface water resources are being exploited by the use of wells, springs, and aqueducts.

- The watershed under study:
According to JAMAB’s classification, the country is divided into 12 watershed areas. Tehran province is covered by parts of four watershed areas: Sefidrood, the Caspian Sea, Namak Lake, and the central Kavir. However, the greatest part of the province is covered by the Namak Lake watershed area (69% of the total area of the province). Each of the watershed areas has its own characteristics.

- Important rivers of the province:
The Alborz heights in the north have provided appropriate grounds for precipitation and the forming of rich and ever-flowing rivers. There are many such rivers in the province that are used for industry and agricultural purposes. The most important rivers include Hableh River, Abhar River, Lar River, Jajrood, Taleghan River, Karaj River.

The latter river is one of the greatest rivers of the province, originating in the southern part of Alborz Mountain, 40 kilometers off the west of Tehran. The great Amir Kabir dam was built on this river on Chaloos Road. The beach of the river provides a beautiful place for Tehran and Karaj people to spend their holidays.
Tehran province watersheds (2006)

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