The sandstone promontory of Borden Hill rises 450’ above the surrounding floodplain of the Heort Creek. Steeply sloped for the first 325’ the hill plateaus out to form an ideal defensive location. The sandstone of the upper hill is hard, that of the lower hill softened by the high water table. The sandstone splits causing caves and narrow paths between rocks.
The plateau of Borden Hill is oval shaped and some 1500’ along its longest axis, and some 1000’ along its short axis.