Haringvliet-west is a significant tidal estuary and Natura 2000 protected area in the province of South Holland, Netherlands. This body of water is part of the larger Haringvliet system, which connects the Rhine and Meuse rivers to the North Sea. The area is a transitional water body, blending freshwater influences from the inland river systems with the saline conditions of the sea. It covers an area of approximately 45.88 square kilometers and functions as a crucial ecological corridor and habitat.