The Gangetic Plain : UP,Bihar,WB.
Upper Gangetic Plain : Western Uttar Pradesh(From Yamuna to Ghaghara plains
Rohilkhand plain(sandy area))
Middle Gangetic Plain : Eastern UP & N.B(Awadh ,Kosi area (prone to flooding))
Lower Gangetic Plain : WB.(sunderban delta)
Ox-Bow lakes are found in the middle Gangetic plain, because rivers meander in this region.