Farewell Spit is a classic recurved spit, approximately 30 km long, composed predominantly of uniform quartz sand derived from rivers draining westwards and transported northward by the Westland Current. The north is exposed to the Tasman Sea, but the south has extensive tidal mudflats. These provide feeding areas for large numbers of waterfowl. The Australasian Gannet colony at the end of the spit continues to grow, although birds are forced to move sites as dunes are eroded by sea action.
BirdLife International (2021) Important Bird Areas factsheet: Farewell Spit. Downloaded from http://www.birdlife.org on 28/11/2021.