<Tr> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td_colspan="3"> Castlereagh River </Td> <Td> 121 </Td> <Td> 397 </Td> <Td> Macquarie </Td> <Td> NSW </Td> <Td> 541 </Td> <Td> 336 </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td_colspan="3"> Talbragar River </Td> <Td> 258 </Td> <Td> 846 </Td> <Td> Macquarie </Td> <Td> NSW </Td> <Td> 277 </Td> <Td> 172 </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td_colspan="2"> Coolaburragundy River </Td> <Td> 271 </Td> <Td> 889 </Td> <Td> Talbragar </Td> <Td> NSW </Td> <Td> 156 </Td> <Td> 97 </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td_colspan="3"> Little River (Dubbo) </Td> <Td> 271 </Td> <Td> 889 </Td> <Td> Macquarie </Td> <Td> NSW </Td> <Td> 122 </Td> <Td> 76 </Td> </Tr>

Why is the murray darling basin the most fertile region of australia