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 (New Zealand electorate) for the first time, including Bay of Plenty. The current Bay of Plenty electorate is wrapped around Tauranga city, but does not include the city. It does include Matakana Island. Prior to the 2007 boundary review, it did not extend to the western side of Tauranga or to Matakana Island. Instead it comprised a section of the central Bay of Plenty coast, from the eastern periphery of the Tauranga urban area to outside the main populated part of Whakatane. It included the towns of Te Puke, Edgecumbe and Papamoa. Rapid population growth around Tauranga has driven considerable boundary change at