The two principal river systems located in south central australia are called darling ayers murray tasman

The two principal river systems located in south central Australia are called Murray and Darling.

The Murray and the Darling rivers are the two main longest rivers in Australia. Water from the two rivers converges to form the Murray–Darling Basin which is the largest and the most complex river system situated in south central Australia. The Murray–Darling Basin extends over more than 1 million square kilometres of land which is equivalent to 14% of mainland Australia.

i do believe that its called,(the segovia highlands); plz check first good luck;