Crystal Brook is a town in the Mid North of South Australia, 197 kilometres north of the capital, Adelaide. According to the 2021 Census, the population of the town was 1,322. Crystal Brook is in a very picturesque location, being at the start of the Flinders Ranges. The town has multiple viewing points and parks. It was named after the spring-fed creek next to which it was founded.

Goyder's Line is a line that runs roughly east–west across South Australia and, in effect, joins places with an average annual rainfall of 10 inches (250 mm). North of Goyder's Line, annual rainfall is usually too low to support cropping, with the land being suitable only for grazing. Related to that, the line also marks a distinct change in vegetation. To the south, it is composed mainly of mallee scrub, whilst saltbush predominates to the north of the line.