Answer: zuiderzee

AnswerCrossword Clue
ZUIDERZEE

Literally, Dutch for "southern sea"

ZUIDERZEE

The IJsselmeer was part of it before construction of the Afsluitdijk

ZUIDERZEE

Body of water, now Ijssel Lake.

ZUIDERZEE
Feature of N and central Netherlands.
ZUIDERZEE
One-time inlet of the North Sea
ZUIDERZEEOnetime inlet of the North Sea