Jena:
Jena is a university city in central Germany on the River Saale. It is the second largest city in the federal state of Thuringia, after Erfurt.
The city's economy is based on the high-technology industry and research. The optical and precision industry is the leading branch to date, while software engineering, other digital businesses and biotechnology are of growing importance. Furthermore, Jena is also a service hub for the surrounding regions.
Jena lies in a hilly landscape in the east of Thuringia, within the wide valley of the Saale river.