Reimerswaal is a municipality in the province of Zeeland in the southwestern Netherlands on Zuid-Beveland, named after the lost city. The municipality had a population of 22,678 in 2019, and has a surface area of 242.42 km² of which 140.62 km² is water. The central town Yerseke is known for trade in mussels and oysters. Kruiningen is known for the former ferry from Kruiningen to Perkpolder which was in service up to 2003. The municipality of Reimerswaal was established in 1970, from the aggregation of the municipalities Krabbendijke, Kruiningen, Rilland-Bath, Waarde, and Yerseke.
The municipal coat of arms dates to 1970. The sword in a red field is derived from the coat of arms of the lost city of Reimerswaal in use in the 15th century of gules two swords inverted saltirewise argent and or. In addition, the municipal coat of arms shows the comital arms of Wittelsbach-Hainaut in chief.