The lands administrative divisions of South Australia are the cadastral (i.e., comprehensively surveyed and mapped) units of counties and hundreds in South Australia. They are located only in the south-eastern part of the state, and do not cover the whole state. 49 counties have been proclaimed across the southern and southeastern areas of the state historically considered to be arable and thus in need of a cadastre. Within that area, a total of 540 hundreds have been proclaimed, although five were annulled in 1870, and, in some cases, the names reused elsewhere.