Karbonkelberg, Mountain summit in Hout Bay, South Africa.

Karbonkelberg is a mountain summit in Hout Bay that rises to 594 meters with multiple hiking trails crisscrossing its slopes. The peak offers views across the Atlantic Ocean and overlooks areas within Table Mountain National Park.

During World War II, a radar station was built near the summit as one of 15 strategic monitoring points along the Western Cape coast. This military installation played a key role in protecting the region during the war.

The name Karbonkelberg is Afrikaans-Dutch for "carbuncle mountain", from karbonkel, a carbuncle or garnet, not coal. The name refers to the reddish garnet stones found on the slopes, which glint in the sun. The peak is a landmark above Hout Bay harbour, and locals have long slid down its wind-blown sand slope on polished boards or sheets.

The peak is reached on foot or by mountain bike from Hout Bay; the cliffs on the southern side are a climbing spot. Sand blown up the slope forms a dune-like patch that locals slide down on polished boards or sheets. The weather shifts quickly on this coastal peak, so check conditions before setting out.

Sand blown up the slope by the wind has built a dune-like patch near the summit, and local residents slide down it on polished boards or sheets of cardboard. The cliff on the southern side is a known climbing spot, and the peak is also ridden by mountain bikers.