The Hundred of Adelaide is the cadastral unit of hundred for the city of Adelaide. It is one of the eleven hundreds of the County of Adelaide, and was one of the first hundreds to be proclaimed. Like the surrounding city, the hundred was named after Queen Adelaide. It was named by Governor Frederick Robe in 1846. It is 106 square miles (270 km2); close to but not exactly one hundred square miles as with most of the other hundreds. According to an 1886 map, its boundaries were the Torrens River to the north and the Sturt River to the south. It is used on land titles in the area and referenced in various legal acts dealing with property law.