The Upper North of South Australia is the name given to the region centred roughly on Jamestown, about 200km north of Adelaide. It is an irregular rectangle about 170km from east to west and 140km from north to south, bounded by the shore of Spencer Gulf on the west, and extending as far as the towns of Redhill and Yacka in the south, Hallett and Oodla Wirra in the east, and Wilmington and Orroroo in the north. Council boundaries in the region have been subject to considerable change in recent years, but the local government areas making up the region at present are the Port Pirie Regional Council, the Northern Areas Council, the District Councils of Mount Remarkable and Peterborough, the southern part of the District Council of Orroroo/Carrieton (formerly Orroroo) and the northern part of the Regional Council of Goyder (formerly Hallett).