The Prussian Province of Hesse-Nassau was a region in central Germany established in 1866 after the Prussian victory in the Austro-Prussian War. It combined the territories of Hesse-Kassel and parts of Nassau, becoming an important administrative unit within the Kingdom of Prussia. The province was known for its diverse landscapes, including forests and rivers, and played a significant role in the economic development of the area. The province was governed from the city of Wiesbaden, which served as its capital. It was characterized by a mix of urban and rural communities, with a population that included various cultural and ethnic groups. The region contributed to the industrial growth of Prussia and was integrated into the larger framework of the German Empire after its formation in 1871.