The Air Force Base Swartkop, Pretoria, being the site described as the original Portion A of the eastern portion of the farm Zwartkop, now known as Portion 18 of the farm Zwartkop 476, excluding the old Johannesburg road servitude (R101) and the portion west thereof, known as the Air Force Gymnasium, but including the portion bordering on the south of the above area and extending in a southerly direction to the existing security walls on the eastern, southern and western boundaries of the site.