There is also Flagstaff Hill, one near Burra and Renmark in South Australia Flagstaff Hill is a suburb in the City of Onkaparinga, South Australia. It is named after the hill by that name in the area, where Colonel William Light erected a flagstaff during his survey, which was then used as a trig point. Flagstaff Hill is a leafy suburb established around the Sturt Gorge Recreation Park, maintaining many parks and reserves throughout the suburb.