Oguta Lake
It is the largest natural lake in Imo State , Southeastern Nigeria;<ref name="http://citeseerx . ist . psu . edu"></ref> within the equatorial rainforest region of Niger Delta . 
<triplet> Imo State <subj> Nigeria <obj> country <triplet> Nigeria <subj> Imo State <obj> contains administrative territorial entity <triplet> Niger Delta <subj> Nigeria <obj> country