The Flinders Ranges are the largest mountain range in South Australia, which starts about 200 km (125 mi) north of Adelaide. The discontinuous ranges stretch for over 430 km (265 mi) from Port Pirie to Lake Callabonna.Its most characteristic landmark is Wilpena Pound, a large, sickle-shaped, natural amphitheatre that covers 80 km2 (31 sq mi), and contains the range's highest peak, St Mary Peak (1,171 m (3,842 ft)) that adjoins the Flinders Ranges National Park.