On 15 October 1993, land in section 11 of the Hundred of Borda, section 64 of Hundred of Gosse and Allotments 50 and 52 in DP 38340 and with an area of 416 sqkm was removed from the national park and consitututed under the Wilderness Protection Act 1992 as the Ravine des Casoars Wilderness Protection Area.