Tuzla is the economic, cultural, educational, health and tourist centre of northeast Bosnia. It is an educational center and is home to two universities. It is also the main industrial machine and one of the leading economic strongholds of Bosnia with a wide and varied industrial sector including an expanding service sector thanks to its salt lake tourism. The city of Tuzla is home to Europe's only salt lake as part of its central park and has more than 350,000 people visiting its shores every year. The history of the city goes back to the 9th century; modern Tuzla dates back to 1510 when it became an important garrison town in the Ottoman Empire.