The mountain is drained by several creeks, and has many gullies on its slopes such as the ones present on the ring track and the one directly south of the mountain known as Hell Hole after an axe murder by a convict who dispatched a labourer known as Old Tom in Byarong Creek. The south and western slopes are drained by Byarong Creek which flows west of Byarong Park before descending to Figtree and then to the sea. The eastern slopes are drained by creeks that flow into Para or Fairy Creek which flows through the Wollongong Botanic Gardens before arriving at Fairy Lagoon at Puckeys Estate Reserve. The northern slopes are drained by Cabbage Tree Creek.