This is a heavily built species with adults approaching or exceeding 2 m (6 ft 5 in) in total length. Many captive specimens have been recorded at 3 m (9 ft 9 in) and slightly longer.
The colour pattern consists of a brown to reddish ground colour with a highly variable pattern of pale intrusions. There are normally black borders around the intrusions that become more extensive around the tail. The belly is yellowish to pale cream.
Prefers very arid desert areas. Normally arboreal, inhabiting ranges and rocky outcrops.