Mahaweli is the longest river in Sri Lanka. It is begin from the Sripada Mountain. The long rate of this river is 340 kilo meters. The Mahaweli River collects in to the sea near the Koddiyar bay in Trincomalee. The Mahaweli River provides enough water for the cultivations. The water is allocated through the irrigation system to the paddy field. At the same time the electricity is generated by the many projects. The kandy procession is concluded by water cutting ceremony which is performed in the Mahaweli River.