Karoon:

karoon is the bigest river in Iran it is on the south west of Iran. It has 890 km long.every second 750 m² passing from this river and in one year the water that passing is about 23652000000 m^{2 .}  

karoon begin from zard kooh (a mountain in south west of Iran ). Karoon wide is different in each part.when karoon passing the mountains it has about 250 m wide. And when karoon is near Persian gulf it has 500 m wide but in some part karoon has 1100m wide. Karoon has different depth too. From 2 until 8 m.

 karoon is the only river in Iran that ships can go through it. But actually not all  of the ships just some of them that are 7 or 8 thousand tons. Karoon is a very important river for the people that live near it.