Bay of Plenty region was formed in 1989 after a nationwide review and shakeup of top-level local government in New Zealand. The new region incorporated the former counties of Tauranga, Rotorua, Whakatane and Opotiki. On 5 October 2011, the MV Rena ran aground on the Astrolabe Reef in the bay causing a large oil spill, described as New Zealand's worst ever environmental disaster. The region is subdivided into territorial authorities, which include the Western Bay of Plenty District, Tauranga City, Whakatane District, Kawerau District and Opotiki District, as well as parts of Rotorua District and the town of Rangitaiki in Taupo District. The
Western Bay of Plenty District area that is not part of the district). The district came into being in the local government reorganisation of 1989; with minor modifications to the boundaries, it merged the old Tauranga County and Te Puke Borough. The greatest changes were in the northwest, with Waihi Beach being transferred to the district from the old Ohinemuri County, and in the vicinity of Tauranga City, where some of the hinterland, formerly in the county, was transferred to the city. The wards (for the purposes of electing district councillors) are the following: Western Bay of Plenty District Western Bay of Plenty District is