Ocna Mureș (Romanian pronunciation: [ˌokna ˈmureʃ]; Hungarian: Marosújvár, German: Miereschhall) is a town in Alba County, Romania, located in the north-eastern corner of the county, near the Mureș River, with a population of 15,503 inhabitants as of 2002. The town is situated next to a large deposit of salt, mined in the past until the ceiling of the mines collapsed from water infiltration in 1978. Ocna Mureș has a chlorosodic products plant,a salt extraction plant and a spa which uses the salty water from the former mines.