Tholen is a 25,000 people municipality in the southwest of the Netherlands. The municipality of Tholen takes its name from the town of Tholen, which is the largest population center in the municipality.
The municipality consists of two peninsulas, formerly islands, the larger one on the south also called Tholen, the smaller one on the north called Sint Philipsland. The two are separated by the former strait, now bay, of Krabbenkreek. The municipality is bordered on the east by the Eendracht, once a Scheldt branch but now part of the Scheldt-Rhine Canal, crossed by three road bridges, by the Oosterschelde estuary to the south, the straits of Keeten-Mastgat to the west and the Krammer strait to the north.
The town has a small historical center partly surrounded by a "gracht" and partly bordered by a harbour for fishing boats and yachts.