The islands of Maderne, Storeholm and Lilleholm are part of the Præstø Fjord Wildlife reserves (Præstø Fjord Vildtreservat).
As of January 1, 2007, Præstø municipality ceased to exist as the result of Kommunalreformen ("The Municipality Reform" of 2007). It was merged with existing Langebæk, Møn, and Vordingborg municipalities to form an enlarged Vordingborg municipality. This created a municipality with an area of 615 km² and a total population of 46,307 (2005). The municipality belongs to the new Region Sjælland ("Zealand Region").