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A gravel pit that is still in partial activity in 2021. On an island in the middle of the lake breeds an impressive Mediterranean Gull colony.
La Grande Bosse is part of a complex of many lakes along the river Seine. It holds the biggest Mediterranean Gull colony in the Paris area. Very impressive with several hundreds of pairs, also with Black-headed Gull. The area is also a nesting place of Red-crested Pochard. And you can expect different species of waders, ducks, herons and raptors in migratory stopover or in winter.
Best visited by car (no train station close-by). You can park at several places along the lake, the small road is not busy at all.