Bad Kreuznach is a spa town in the Rhineland-Palatinate state of Germany. It is located on the Nahe River, some 20 km (12 mi) north of the city of Koblenz and some 30 km (19 mi) south of Mainz. The town is best known for its spa and resort facilities, as well as for its wine. It is also the home of the Römerkastell, a reconstructed Roman fort, and the Bad Kreuznach Jazz Festival. The town is surrounded by vineyards and produces a variety of wines, including some of the best Rieslings in Germany. There are also a few sparkling wines (Sekt) made in Bad Kreuznach.