Windeyer County is located between the border with South Australia and a river measuring how long from its source to its confluence with the Murray River?
Windeyer County:  It is located between the Darling River and the border with South Australia. Darling River: The Darling River is the third longest river in Australia, measuring 1472 km from its source in northern New South Wales to its confluence with the Murray River at Wentworth, New South Wales.
1472 km