The Jajrud (Jājrūd), also spelled as Jajrood, Djadjéroud or Djaderoud,[1] is a river in northern Iran that passes through the provinces of Mazandaran and Tehran. It flows south through the central Alborz mountain range. It is a tributary of the Karaj River, which empties into the endorheic Namak Lake basin.

Number 5 on the lower side of map shows the Jajrud.
| Map of central Alborz | Peaks: | 1 Alam-Kuh |
|---|---|---|
−25 to 500 m (−82 to 1,640 ft) 500 to 1,500 m (1,600 to 4,900 ft) 1,500 to 2,500 m (4,900 to 8,200 ft) 2,500 to 3,500 m (8,200 to 11,500 ft) 3,500 to 4,500 m (11,500 to 14,800 ft) 4,500 to 5,610 m (14,760 to 18,410 ft) |
2 Azad Kuh | 3 Damavand |
| 4 Do Berar | 5 Do Khaharan | |
| 6 Ghal'eh Gardan | 7 Gorg | |
| 8 Kholeno | 9 Mehr Chal | |
| 10 Mishineh Marg | 11 Naz | |
| 12 Shah Alborz | 13 Sialan | |
| 14 Tochal | 15 Varavašt | |
| Rivers: | 0 | |
| 1 Alamut | 2 Chalus | |
| 3 Do Hezar | 4 Haraz | |
| 5 Jajrood | 6 Karaj | |
| 7 Kojoor | 8 Lar | |
| 9 Noor | 10 Sardab | |
| 11 Seh Hazar | 12 Shahrood | |
| Cities: | 1 Amol | |
| 2 Chalus | 3 Karaj | |
| Other: | D Dizin | |
| E Emamzadeh Hashem | K Kandovan Tunnel | |
| * Latyan Dam | ** Lar Dam |
| |
|---|---|
| Lake Urmia basin | |
| Persian Gulf basin | |
| Oman sea basin | |
| Caspian basin |
|
| Gavkhouni basin | |
| Namak Lake basin |
|
| Hamun-e Jaz Murian basin | |
| Other | |
Protected Areas of Iran | |
|---|---|
| National Parks |
|
| National Natural Monuments | |
| Wildlife Refuges |
|
| Protected Areas |
|
BR: Biosphere Reserve - IW: International Wetland (Ramsar Site) - All names as inscribed by the Department of Environment, Iran | |
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