Roto District Subcatchments Roto (southern) Valleys and Floodplains – Sandplains and Minor Dunefields – Sandplains and Low Rises Roto Sandplains, Swales and Dune Crests – Sandplains and Minor Dunefields – Rocky Outcrops Roto (eastern) Sandplains and Minot Dunefields – Lower Slopes and Hills – Rocky Outcrops