From Wikipedia, the free encyclopedia.

Jena is a city in eastern Germany on the River Saale in Thuringia. Its population is 101,325 (as of 30 June 2003).
On October 14, 1806 Napoleon fought the Prussian army here (Battle of Jena-Auerstedt).
Jena is a manufacturing city, specializing in precision machinery, pharmaceuticals, optics and photographic equipment, and home to the famous Zeiss optics plant.History
Economy

