What is the X in X-mas?
city, Yaroslavl oblast (province), northwestern Russia, on the Volga River. The 12th-century village of Rybnaya sloboda became the town of Rybinsk in 1777. Its river port flourished after the opening (1810) of the Mariinsk Waterway, linking the Volga to the Baltic Sea, and again with the latter's reconstruction as the deep Volga-Baltic Waterway in 1964. A wide range of engineering and other products are made in the city.