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Jena is a city in central Germany on the River Saale in Thuringia. Its population is 101,325 (as of 30 June 2003).
On October 14, 1806 Napoleon fought and defeated 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.