From the Wikipedia page 
Müritz is a former Kreis (district) in the southern part of Mecklenburg-Vorpommern, Germany. It is named after the lake Müritz. Neighboring districts were (from the west clockwise) Parchim, Güstrow, Demmin, Mecklenburg-Strelitz, the district-free city Neubrandenburg and the district Ostprignitz-Ruppin in Brandenburg. The district was disbanded at the district reform of September 2011. Its territory has been part of the Mecklenburgische Seenplatte district since.