Oguta Lake 's catchment area comprises the drainage area of the Njaba River and a part of the River Niger floodplain in the region south of Onitsha .
It is the largest natural lake in Imo State , Southeastern Nigeria ; within the equatorial rainforest region of Niger Delta .
lake   's catchment area comprises the drainage area of the Njaba River and a part of the River Niger floodplain in the region south of Onitsha .
It is the largest natural lake in Imo State , Southeastern Nigeria ; within the equatorial rainforest region of Niger Delta .