The Adelaide Plains Council (formerly the District Council of Mallala) is a local government area in South Australia. It consists of a largely rural region along the Gulf St Vincent, covering a total area of approximately 926 km. The council seat lies at Mallala, but it also maintains a service centre at Two Wells.
The Light River (Kaurna: Yarralinka), commonly called the River Light, is a seasonal and significant river in the Mid North region of the Australian state of South Australia named for early surveyor William Light.
The River Light has given its name to the region of the state spanning the mid and lower part of the watercourse, which doesn't dry up over summer. The County of Light (cadastral land division) lies either side of the river for much of its course and gave rise to the name of three former local government bodies within the land division: the District Council of Light (1867–1892), the District Council of Light (1977–1996), and the present-day Light Regional Council, established in 1996. The locality of Lower Light spans the area where the river meets the coast in the Adelaide Plains and the Adelaide Plains Council was initially named Light from 1935 until 1937 after the river.