The area unit stretches between the Waikato River and the summits of the Hapuakohe Range, at the boundary of Hauraki District. The area excludes Te Kauwhata, the largest settlement within it, but includes Hampton Downs, Ohinewai, Rangiriri, Spring Hill Prison, Taniwha, Lake Waikare, Whangamarino and Whangamarino River.