Walcheren is a region and former island in the Dutch province of Zeeland at the mouth of the Scheldt estuary. It lies between the Eastern Scheldt in the north and the Western Scheldt in the south and is roughly the shape of a rhombus. The two sides facing the North Sea consist of dunes and the rest of its coastline is made up of dykes. Middelburg, the provincial capital, lies at Walcheren's centre. Vlissingen, 9 kilometres (5.6 mi) to the south, is the main harbour and the third municipality is Veere.

Noord-Beveland is a municipality and region in the southwestern Netherlands and a former island, now part of the Walcheren-Zuid-Beveland-Noord-Beveland peninsula. Noord-Beveland is enclosed by the Oosterschelde estuary to the north, and the former straits, now combined lake, of Veerse Meer and Zandkreek to the south. As part of the Delta Works, dams have connected Noord-Beveland to Walcheren and Zuid-Beveland.