 The Nelson territorial authority area is small (just 445 km2) and has four main waterways, the Whangamoa, Wakapuaka, Maitai and Roding Rivers.The Roding River, the southernmost in Nelson, arises in the hills between Mount Meares and Dun Mountain.From there is flows westward before entering the Tasman District where it eventually joins the Waimea River which flows into Waimea Inlet near Rabbit Island.