A very large bay with islands, mudflats (22,000 ha), raised saltmarsh (>1,000 ha), grassland and arable land, rocky coast and cliffs. Human activities include cattle-raising.
This is an important site, holding 20,000 or more wintering and passage waterbirds on a regular basis. It is also an important area for passage passerines.
Pressure/threats to key biodiversity
The drainage of wet meadows for cultivation is slowly causing the drying out the whole area. Breeding sites for waterbirds are being lost.
National Partial International High7,850 ha of IBA covered by Hunting Reserve (Baie du Mont Saint Michel, 7,850 ha). 22 ha of IBA covered by Private Reserve (Ile des Landes, 22 ha). 18,000 ha of IBA covered by Special Protection Area (Baie du Mont Saint Michel, 18,000 ha). 62,000 ha of IBA covered by Ramsar Site (Baie du Mont Saint Michel, 62,000 ha).