Rivers of the country: Iranian rivers are divided into 12 basins: 1.    Caspian Sea basin 2.    Persian Gulf and Oman Sea basin 3.    Urmieh basin 4.    Qom salt lake basin 5.    Isfahan and Sirjan basin 6.    Neiriz basin 7.    Jazmorian basin 8.    Dashte Kavir basin 9.    Kavireloot basin 10.     Ardestan basin 11.     Ghareh ghoum basin 12.     Hamoun basin