Map doubt GODAVARI and KAVERI

WHAT IS GODAVARI AND CAUVERI?

People are saying Godavari is Dakshini Ganga and CAUVERI is Ganges of the South, but Dakshini Ganga itself means Ganges of the South! So in I.C.S.E. if we are asked:

Mark the Southern Ganges .

Then what will we mark?