River Indus is the largest river which originates from lake Maansarowar in Tibet passing through the Himalayas enters into Pakistan territory near Gilgit. In the upper region a number of streams joins it, but at the later stage some of western and eastern tributaries make it more huge and vast in volume and speed. Its eastern tributaries includes river Swat, Kunar, Panjgore, Kabul, Kurram, Tochi, Gomal and Bolan etc. Satlaj, Beas, Ravi, Chenab, Jhelum are the main eastern tributaries of river Indus. All these rivers after originating from Himalayas mountains and passing through the areas of Kashmir enter into the territory of Pakistan. The river Bias joins Satlaj near Harike in East Punjab (India). Similarly Satlaj, Ravi, Chenab and Jhelum after passing through Punjab in Pakistan join at place known as Panjnad (meaning five rivers). After merging at that place these then join collectively in river Indus at Mithankot. After partition, India and Pakistan signed a treaty of division of Indus water which deprived Pakistan from the use of waters of Satlaj, Beas and Ravi. The Indus plain areas can be divided into three (i) the upper Indus plain (from Attock to Mithankot), (ii) the lower Indus plain (from Mithankot to Thatta), (iii) the deltaic plain (from Thatta to coastal strips). The indus delta begins near Thatta (Sindh) ultimately river Indus joins with the water of Arabian Sea.