Ptychadena wadei
It is endemic to Ethiopia and only known from a small area southeast of Lake Tana , in the upper reaches of the Blue Nile . 
<triplet> Lake Tana <subj> Ethiopia <obj> basin country <subj> Blue Nile <obj> lake outflow <triplet> Blue Nile <subj> Ethiopia <obj> country <subj> Lake Tana <obj> lakes on river