Title: Bad Ems
Content:   Bad Ems 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", becacuse of its famous hot springs and 18-20th century architecture bearing testimony to the popularity of spa resorts in Europe during that time.
Title: Bad Ems station
Content:  Bad Ems is a station in the town of Bad Ems in the German state of Rhineland-Palatinate. It is on the Lahn Valley Railway (Koblenz–Wetzlar). The entrance building is heritage-listed.
Title: Bad Ems (Verbandsgemeinde)
Content: 1) Arzbach ; 2) Bad Ems ; 3) Becheln ; 4) Dausenau ; 5) Fachbach ; 6) Frücht ; 7) Kemmenau ; 8) Miellen ; 9) Nievern Bad Ems is a former Verbandsgemeinde ("collective municipality") in the Rhein-Lahn-Kreis, in Rhineland-Palatinate, Germany. In January 2019 it was merged into the new Verbandsgemeinde Bad Ems-Nassau. Its seat was in Bad Ems. The Verbandsgemeinde Bad Ems consisted of the following Ortsgemeinden ("local municipalities"): 
Title: Bad Ems
Content: Droitwich Spa (United Kingdom) ; 🇵🇱 Lubin (Poland) ; 🇫🇷 Cosne-Cours-sur-Loire (France) ; 🇩🇪 Blankenfelde-Mahlow (Germany) Bad Ems is twinned with:
Title: Bad Ems
Content:  The town is located on both banks of the River Lahn, the natural border between the Taunus and the Westerwald, two parts of the Rhenish Slate Mountains. The town and its outer districts are situated within the Nassau Nature Reserve.
Title: Bad Ems
Content:  Industry in Bad Ems is mainly limited to companies related to its spa status, but nonetheless fairly varied, including medicine, electrical engineering and tourism.
Title: Bad Emstal
Content:  Bad Emstal is a municipality in the district of Kassel, in Hesse, Germany. It is situated 19 km southwest of Kassel, Germany.
Title: Bad Ems
Content:  The town is linked to a view point at the Bismarckturm (Bismarck tower) by the Kurwaldbahn funicular railway. Bad Ems station lies on the Lahn Valley Railway.
Title: Bad Ems station
Content: 456: Bad Ems–Welschneudorf–Montabaur ; 547: Bad Ems town route ; 557: Bad Ems–Arzbach–Neuhäusel(–Koblenz) The following bus routes stop at the nearest bus stop, called Bad Ems Hauptbahnhof:
Title: Bad Ems-Nassau
Content: 1) Arzbach ; 2) Attenhausen ; 3) Bad Ems ; 4) Becheln ; 5) Dausenau ; 6) Dessighofen ; 7) Dienethal ; 8) Dornholzhausen ; 9) Fachbach ; 10) Frücht ; 11) Geisig ; 12) Hömberg ; 13) Kemmenau ; 14) Lollschied ; 15) Miellen ; 16) Misselberg ; 17) Nievern ; 18) Nassau ; 19) Obernhof ; 20) Oberwies ; 21) Pohl ; 22) Schweighausen ; 23) Seelbach ; 24) Singhofen ; 25) Sulzbach ; 26) Weinähr ; 27) Winden ; 28) Zimmerschied Bad Ems-Nassau is a Verbandsgemeinde ("collective municipality") in the Rhein-Lahn-Kreis, in Rhineland-Palatinate, Germany. The seat of the Verbandsgemeinde is in Bad Ems. It was formed on 1 January 2019 by the merger of the former Verbandsgemeinden Bad Ems and Nassau. The Verbandsgemeinde Bad Ems-Nassau consists of the following Ortsgemeinden ("local municipalities"): 

Question: What is Bad Ems the capital of?
Answer: Rhein-Lahn-Kreis.