What makes ijsselmeer different from other landforms in western europe?

Europe is a mainland going from the Atlantic Ocean to the mountain go known as the Urals, which is Russia. Western Europe is only a topographical term. Its man made.

The IJsselmeer is a cut off inland narrows in the focal Netherlands flanking the territories of Flevoland, North Holland and Friesland. It quantifies 1,100 km² with a normal profundity of 5.5 m. The waterway IJssel streams into the IJsselmeer.