The Koohrang (also known as Kouhrang and Kurang) is a river originating in the Zagros mountains of western Iran, which joins the Beheštābād river (32°00′44″N 50°36′37″E) to form the Karun, Iran's largest (by volume) river. A series of tunnels (Kuhrang Tunnels) have been built since the 1950s to redirect some of the Kuhrang's water toward the Zayandeh River to meet the demands of increased population in Esfahan and Yazd provinces.
The Zayandeh River basin encompasses about 41,500 square kilometres (16,000 sq mi) and is connected to the upper Karun River basin (which drains to the Persian Gulf) by the Kuhrang Dam and Tunnel 1 (32°26′10.94″N 50°06′04.50″E) constructed in 1953 although first proposed in the early sixteenth century. Two additional tunnels (Kurang 2 and Kurang 3) were constructed in late 1990s and early 2000s.
The Koohrang (also known as Kouhrang and Kurang) is a river originating in the Zagros mountains of western Iran, which joins the Beheštābād river (32°00′44″N 50°36′37″E) to form the Karun, Iran's largest (by volume) river. A series of tunnels (Kuhrang Tunnels) have been built since the 1950s to redirect some of the Kuhrang's water toward the Zayandeh River to meet the demands of increased population in Esfahan and Yazd provinces.
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