The old Celtic town of Hallein lies about 15km south of Salzburg on the River Salbach, which here surfaces from the mountains into the Alpine foreland. It takes its name from the ancient salt mines here. It is the main township in the Tannengau and of industrial importance which is the chief manufacturer of chemicals, machinery, salt-mining in the Dürrnberg, with a college of woodworking and building material. There were settlers on this place as early as 700 BC Hallein was settled its charter in 1230. Prehistoric populace almost certainly worked the Dürrnberg salt mines some 4,500 years ago.