[2] It extends from the Fleurieu Peninsula in the southwest to the Murray Mouth in the southeast to Point Sturt on the Sturt Peninsula and the course of the Bremer River in the east, Mount Barker in the north and Sellicks Hill on the Gulf St Vincent coastline in the northwest including the southern end of Mt Lofty Ranges, Hindmarsh Island, Mundoo Island and part of Lake Alexandrina.

[2] This includes the following contemporary local government areas: The following hundreds have been proclaimed within the county – Encounter Bay, Goolwa, Kondoparinga, Macclesfield, Myponga, Nangkita, Waitpinga and Yankalilla in 1846, Strathalbyn in 1850, and Alexandrina and Bremer in 1851.

It covers an area of 240 square kilometres (92 sq mi) and is named after the British naval officer, Sir J Gordon Bremer.

It covers an area of 300 square kilometres (117 sq mi) and its name is derived from an aboriginal word meaning "place of little frogs".

[16][7][17] The Hundred of Strathalbyn was proclaimed in 1850 and covers an area of 210 square kilometres (83 sq mi) immediately west of the Bremer River.

It covers an area of 320 square kilometres (123 sq mi) and is reportedly named after an aboriginal word, "Waitpiinga" meaning "the windy place".

Tindale: It is derived from the Aboriginal word jankalan, meaning "falling, from an incident in the myth of Tjilbruke, whose sister's [sic] mummified body began to fall into pieces here, as he was carrying it from Brighton to Cape Jervis for burial.The hundred includes the following localities – Bald Hills, Hay Flat, Normanville, Rapid Bay, Second Valley, Torrens Vale, Wirrina Cove and parts of Cape Jervis, Carrickalinga, Delamere, Inman Valley, Parawa, Silverton, Willow Creek and Yankalilla.