There is a vastly extended network of rivers in Iran most of which seasonally are filled with water. Some permanent rivers run from the Alborz or the Zagros to the Caspian Sea, Persian Gulf and Oman Sea.
Some temporary rivers either run into a body of water or get dried before reaching any watershed. Here are the watersheds of Iran and the rivers emptying in to each of them:
The major rivers running into the Caspian Sea in Iranian shorelines flow from the northern Alborz attitudes like: Aras, Sefid Rud, Chalus, Haraz, Se hezar, Babol, Talar, Tajan, Gorgan, Atrak, Qarasu and Neka.
Arasruns as long as 950km inside Iran before getting to the Caspian Sea. It also irrigates many areas like Moghan Plain at the NW of Iran.
Sefid Rudis said to be 600-780km long from where it originates, Kurdistan Mountains. Gilan plain is a fertile area thanks to Sefid Rud. Fish is farmed in this river.
ChalusRiver is another important river at the north of Iran for fish farming.
Harazis a 150km long river irrigating a large plain in Mazandaran province before getting to the Caspian Sea. Trout is the major fish there.
Se Hezarirrigates Tonekabon plain.
Babolis a very suitable river for fish to spawn and breed.
Talaris 150km long and irrigates a plain called Shirgah at Mazandaran province.
Tajanis 120km long that passes by Sari, the capital of Mazandaran province, and gives life to its banks all the way down to the sea.
Gorganis approximately 300km long irrigating Gorgan plain before getting to its watershed.
Atrakis 500km long and does not always reach Hosein Qoly Bay in Mazandaran province, because it sometimes does not get adequate water from other rivers.
Qarasuis 80km long and originates from the east of Gorgan.
Nekais approximately 100 km long originating from Savad Kuh in Gorgan.
The Zagros serves as the main originating headspring of the rivers running into the Persian Gulf & Oman sea watersheds. Among all these rivers, the major ones are: Arvand Rud, Gamasb, Karun, Jarahi, Zohreh, Dalaki, Mend, Shur, Minab, Mehran and Naband.
Arvand Rudis formed as a result of two rivers joining in Iraq called Euphrates and Tigris. It is from 500m to 1000m wide and brings larger amount of water to the Persian Gulf than any other rivers.
Gamasbflows from Hamedan Mountains, joins another river and is called Seymareh in Luristan. Finally its name is changed into Karkheh in Khoozestan before emptying into the Persian Gulf.
Karunis 850km long and irrigates many areas in the west of Iran. It is navigable and the best time of the year for navigation in it is from December to June.
Zayandeh Rudsplits from Karun and runs toward central Iran.
Dezjoins Karun too.
ZalandMarunjoin and formJarahi, which finally empties into Karun.
Zohrehflows from Kohkyluyeh at the north of Khuzestan province.
Dalakioriginates from Arzhan plain in Fars province and runs into the Persian Gulf near Bandar-e-Abbas.
Mendflows from the NW of Shiraz and runs into the Persian Gulf near Bandar-e-Abbas.
Shurempties into the Persian Gulf after running into marshy and sandy lands at the strait of Hormoz.
RudanandJaghinform a river calledMinabthat empties into the Persian Gulf at the north of the strait of Hormoz.
MehranandNabandflow from Larestan Mountains at the south of Fars province and empty into the Persian Gulf near Bandar-e-Khamir.
“Uromiyeh” is the watershed for the following rivers:Zarineh Rud(240km long),Talkheh Rud(160km long),Simineh Rud,Safi Rudand other minor rivers.
“Masileh” at the east of Qom, is the watershed for the following rivers:Jajrud,Karaj,ShurandMasileh.
“Hoz-e-Soltan” & “Hoz-e-Mareh“, at NW of Masileh, are the watersheds for the following rivers:Masileh,ShurandHableh Rud.
Gav Khoony Marshland Watershed
“Gav khoony” marshland, at SE of Esfehan, is a 700km long watershed filled with the water coming fromZayandeh Rud.
Central Fars Watersheds
There are three watersheds in this region:
“Neyriz” (filled with the water coming fromKorriver),
“Maharlu” (filled with the water coming fromQarabaqriver,) and
“Parishan” (filled with the water coming from two springhead:FamurandPol-e-Abgineh).
Halil RudandBampurare the two rivers emptying into this lake. The lake itself is situated at SE of Iran.
This desert is a watershed within which there are some rivers emptying into it and some subsiding and disappearing into the ground. The rivers are:
Shur(permanent river),Shur Gaz,Tah Rud,Rud posht,Nesa,Rigan,Derakhtangan(permanent river),Siraj,Andujerd,Joftan,Kahnoaj,Keshit,Pashooyeh,Nakhl Ab,Ab Khazan, andChah Nely.
Most of the rivers emptying into this desert, which is also served as a watershed, are seasonal and subside into the ground before emptying into the pit. They are:
Kalimoor(500km long),Kal Shur(250km long),Hableh Rud,DamghanandMojin.
Only %40 of this large watershed is in Iran and the rest is in Afghanistan. It consists of several fresh water lakes that are a series of pits with no specific borders. The most well known lakes in this region are “Hamun-e-Sistan”, “Hamun-e-Sabery” and “Hamun-e-poozak”. When adequate rain falls, they get the main portion of water from a river calledHirmandoriginating from Afghanistan. It passes through 1200km of mountains and lower lands. Other minor rivers in the area areFarah Rud,Har RudandKhashfrom Afghanistan andBandanandShurfrom Iran emptying into Hirmand.
It is a pit at the north of Hamun-e-Sistan. Namakzar is a small lake getting water from all the rivers running from its western side.
Situated at the north of “Hamun-e-Sistan”, it gets water from these rivers:Mashakal,SimishandRootak.
It is situated at the NE of Iran inside Turkmenistan territory getting water from the following rivers:
Hari Rud(coming from Afghanistan, irrigating Sarakhs Oasis and running to Qaraqom sand land) and other rivers joining it likeKashsf Rud,JamandBakhazaroriginating from Iran.
Therefore, although plenty of the rivers were introduced here, water has always been a vital issue. Many of the rivers of Iran contain salty water. Many of them are seasonal. This makes fresh drinkable water even more valuable.
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