 The state's southern border with New South Wales is constituted in the east by the watershed from Point Danger to the Dumaresq River, and the Dumaresq, Macintyre and Barwon rivers.The west of the southern border is defined by the 29th parallel south (including some minor historical encroachments), until it reaches South Australia.Like much of eastern Australia, the Great Dividing Range runs roughly parallel with, and inland from, the coast, and areas west of the range are more arid than the humid coastal regions.