The north–south divide was reinforced in 1989, when local authority boundaries changed. The new Tararua District Council covers northern Wairarapa and southern Hawke's Bay. Central and southern Wairarapa was divided into three district councils: Masterton, Carterton and South Wairarapa. South Wairarapa District Council, based in Martinborough, is the local government authority for areas south of Carterton, encompassing the towns of Greytown, Featherston and Martinborough and the rural areas down to the Hutt. It is separated from Upper Hutt and Lower Hutt cities by the Rimutaka Ranges. Carterton District Council based in Carterton is the fastest growing area in New Zealand and the Masterton District Council covers areas up to the Tararua District.