A bay and estuary with mudflats, coastal cliffs, sand and shingle-beaches and saltmarshes. Human activities include fishing, hunting, and recreation, including sailing.
The site holds 20,000 or more waterbirds in winter, on a regular basis.
BirdLife International (2019) Important Bird Areas factsheet: Baie de Vilaine. Downloaded from http://www.birdlife.org on 06/12/2019.