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Rivers form different types of lakes through their erosional and depositional work. In general, rivers are the destroyers of lakes. In fact, lakes are often obliterated due to filling of sediments and headward erosion by rivers. Fluvially originated lakes are generally temporary and are soon obliterated. Fluviaslly originated lakes include plunge-pool lakes (in front of a waterfall), ox-bow-lakes, alluvial fan lakes, delta lakes, flood plain lakes and raft-dammed lakes. All these lakes may be observed in the upper, middle and lower courses of the Ganga and the Brahmaputra rivers. Lakes formed to the meandering of rivers in the plains of gende gradient are known as alluvial lakes. The ox-bow lakes found in the Middle and Lower Ganga Plains are some such examples.