The high Drakensberg mountains, which form the south-eastern escarpment of the Highveld, offer limited skiing opportunities in winter. The coldest place on mainland South Africa is Buffelsfontein in the Eastern Cape, where a temperature of  was recorded in 2013. The Prince Edward Islands have colder average annual temperatures, but Buffelsfontein has colder extremes. The deep interior of mainland South Africa has the hottest temperatures: a temperature of  was recorded in 1948 in the Northern Cape Kalahari near Upington, but this temperature is unofficial and was not recorded with standard equipment, the official highest temperature is  at Vioolsdrif in January 1993.