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|Municipal assoc.||Bad Ems-Nassau|
|• Mayor (2019–24)||Oliver Krügel (CDU)|
|• Total||15.36 km2 (5.93 sq mi)|
|Elevation||80 m (260 ft)|
|• Density||640/km2 (1,700/sq mi)|
|Time zone||UTC+01:00 (CET)|
|• Summer (DST)||UTC+02:00 (CEST)|
|Part of||The Great Spa Towns of Europe|
|Inscription||2021 (44th Session)|
Bad Ems (German: [baːt ɛms] (listen)) is a town in Rheinland Pfalz, Germany. It is the administrative seat of the Rhein-Lahn rural district and is well known as a spa on the river Lahn. Bad Ems is the seat of the Verbandsgemeinde (administrative community) Bad Ems-Nassau. The town has around 9,000 inhabitants.
In 2021, the town became part of the transnational UNESCO World Heritage Site under the name "Great Spa Towns of Europe", because of its famous hot springs and 18-20th century architecture bearing testimony to the popularity of spa resorts in Europe during that time.