Wainui River (Bay of Plenty) river. Wainui River (Bay of Plenty) The Wainui River is a river of the Bay of Plenty Region of New Zealand's North Island. It flows north from the Kaimai Range to reach Tauranga Harbour south of Katikati. The catchment has of stream margins. 41% of the catchment remains covered in native bush, but 48% is under pasture and suffers soil erosion. The river includes 3 waterfalls of up to , which have been kayaked. The long former East Coast Main Trunk railway bridge is designated as the limit of the Coastal Marine Area. Downstream, a 3-span bridge takes SH2 over
Bay of Plenty become a popular attraction as the number of whales such as blue whales and humpback whales migrating into bay waters began to recover. The Bay of Plenty has 227 km of rail network and 4,460 km of roads. The main rail line in the region is the East Coast Main Trunk Railway, which extends from Hamilton in the Waikato region to Kawerau via Tauranga, with the Murupara Branch Railway extending the Kawerau terminus to Murupara, and the Mount Maunganui Branch connecting the Mount Maunganui terminus with the East Coast Main Trunk. Rail networks in the region are used exclusively for