Oosterschelde

The Eastern Scheldt (Dutch: Oosterschelde) is a former estuary in the province of Zeeland, Netherlands, between Schouwen-Duiveland and Tholen on the north and Noord-Beveland and Zuid-Beveland on the south. It also features the largest national park in the Netherlands, founded in 2002.

Source: Wikipedia (CC BY-SA 4.0) — https://en.wikipedia.org/wiki/Eastern_Scheldt