series of hills in southeastern South Australia, east of Adelaide. A southerly continuation of the Flinders Range, they extend south from a point east of Crystal Brook for 200 miles (320 km) to Cape Jervis. Averaging 15 to 20 miles (24 to 32 km) wide, the ranges are divided at the Barossa Valley into northern and southern segments. The former is higher and rises to Mt. Bryan (3,058 feet 【932 metres】); the latter has peaks generally below 2,000 feet (610 metres) with a high point at Mt. Lofty (2,385 feet 【727 metres】). Most of the rivers originating in these hills, including the Onkaparinga, Gawler, Light, and Torrens, flow down the western slopes to Gulf St. Vincent. The ranges were named by Matthew Flinders (Flinders, Matthew), the explorer who viewed them offshore from Kangaroo Island in 1802. To Adelaide they are important as sources of food (orchards, truck gardens, and dairy farms in the valleys and hills), water, and recreation. Suburbs of Adelaide extend into the foothills. Belair National Park, in the ranges, is a well-developed amenity for the surrounding population.