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Dillenburg, officially Oranienstadt Dillenburg, is a town in Hesse's Gießen region in Germany. The town was formerly the seat of the old Dillkreis district, which is now part of the Lahn-Dill-Kreis. The town lies on the German-Dutch holiday road called the Orange Route, joining towns, cities and regions associated with the House of Orange-Nassau, as well as on the German Timber-Frame Road and the Rothaarsteig hiking trail.