The berg adder (Bitis atropos) is a viper species endemic to mountainous regions in southern Africa.

[5][8] It also occurs in Eswatini, in higher altitudes of eastern Zimbabwe such as the Inyanga Highlands and Chimanimani Mountains, and in nearby Mozambique.

In the northern part of its range, where the winters are cold and dry and the summers warm and wet, it is restricted to higher elevations, up to 3,000 m (9,800 ft).

In Zimbabwe, it is not found below 1,500 m (4,900 ft), usually associated with mountain slopes and rocky hillsides, but also montane grassland with patches of bushes and shrubs.

[5][6] In the southern part of its range (Cape Province, South Africa), where the winters are cold and wet and the summers warm and dry, it can be found in coastal and mountain heathland, as well as small rock outcrops at sea level and grassy areas with clumps of bushes and shrubs west of the Cape Peninsula.

[5][6][8] The atropos adder is unusual among Bitis species in that its venom is predominantly neurotoxic,[5] so much so that the effects of the bite seldom include necrosis or infection.