Rostock, officially the Hanseatic and University City of Rostock, is the largest city in the German state of Mecklenburg-Vorpommern and lie…Rostock, officially the Hanseatic and University City of Rostock, is the largest city in the German state of Mecklenburg-Vorpommern and lies in the Mecklenburgian part of the state, close to the border with Pomerania. With around 210,000 inhabitants, it is the third-largest city on the German Baltic coast after Kiel and Lübeck, the eighth-largest city in the area of former East Germany, as well as the 39th-largest city of Germany. Rostock was the largest coastal and most important port city in East Germany.