its boundaries were created in 1999 along with the selection of its name which was derived from katarapko island. its extent includes all of katarapko island and some land located to the immediate west of the island. it is bounded on all sides by the following watercourses with exception to part of its western and northern sides - the katarapko creek and the murray river. the southern boundary was revised in 2014 to "ensure the whole of kapunda island is within the rural locality of loxton."