Ketelmeer

The Ketelmeer is the tongue of the IJsselmeer into which the River IJssel drains, it is situated between the polders Noordoostpolder and Oostelijk Flevoland, and connects the river IJssel to the IJsselmeer. It is one of the bordering lakes, a continuous body of water which separate Flevoland from the Noordostpolder and the ancient lands of the provinces of Gelderland and Utrecht.

The Ketelmeer covers an area of 3500 hectares, most of which is in the province of Flevoland, but the river delta of the IJssel is in province of Overijssel.

Source: Wikipedia