The Oosterschelde is the largest and wettest National Park in the Netherlands, a vast tidal estuary located in the province of Zeeland. Originally a river estuary, the construction of the Delta Works has transformed it into a shallow sea arm where 800 billion liters of water flow in and out with tremendous force each tide. This creates a dynamic landscape of mudflats, salt marshes, and sandbanks that are exposed and submerged twice daily. The area is renowned for its rich underwater life, which supports both recreational angling and a historic fishing industry.