Franklin District Council has lost its fight to remain independent from Auckland's Supercity plans.
It wanted to become a unitary authority, as it claims to covers a rural area that has nothing in common with the rest of the city.
But Local Government Minister Rodney Hide says the region will instead be split between Auckland, Waikato and Hauraki District Councils.
Sally Davis, chief executive of Franklin District Council, says it means a loss of identity:
The letter from Mr Hide says the reorganisation of eight councils into one will strengthen the region's governance - and result in cost savings for ratepayers.
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