- Gera is a city located in the state of Thuringia in Germany. It is the third-largest city in Thuringia and has a population of approximately 95,000 people. The city has a rich history and is known for its well-preserved medieval architecture, including the Orangerie castle, St. John's Church, and the Market Square. Gera is also home to several museums, parks, and cultural institutions, making it a popular destination for tourists. The city has a diverse economy with industries such as manufacturing, automotive, and healthcare.