What is Rietvlei parkrun, JHB South? It is a 5km run - it's you against the clock. When is it? Every Saturday at 8:00am. Where is it? The event takes place in Rietvlei Farm, Swartkoppies Road, Alberton, R554, 1448. See Course page for more details. What does it cost to join in? Nothing - it's free! but please register before your first run.