The red adder (Bitis rubida ) is a venomous viper species found only in Western Cape Province, South Africa. In Nguni languages "iZansi" No subspecies are currently recognized.
Maximum recorded total lengths (body + tail) are 41.9 cm (16.5 in) for females and 37.7 cm (14.8 in) for males.
Several isolated populations are found in the northern Cape Fold Mountains and inland escarpment in Western Cape Province, South Africa.
