What is "trier-saarburg"

Trier-Saarburg is a district in the west of Rhineland-Palatinate, Germany. Neighboring districts are (from the north and clockwise) Bitburg-Prüm, Bernkastel-Wittlich, Birkenfeld, Sankt Wendel (Saarland), and Merzig-Wadern (Saarland). To the west it borders Luxembourg. The district-free city Trier is completely surrounded by the district.