A group of Hibiscus Coast locals is urging the council to overturn a decision by the Unitary Plan panel to allow development around the Okura estuary.
The panel has recommended the rural urban boundary be extended, which will mean the southern side of the estuary can be urbanised.
The estuary is part of the Long Bay Okura Marine Reserve and environmental groups say the development will pollute the tidal estuary and threaten the wildlife, including the endangered New Zealand dotterel, which nests on the sand spits.