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.

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."