Philadelphia, Pittsburgh, and Allentown are the three most populated cities in Pennsylvania. The rest of the top ten in order are Erie, Reading, Scranton, Bethlehem, Lancaster, Altoona, and Harrisburg.
Eleven out of Russia's top 20 largest cities, including the capital Moscow, are situated on the Volga River. It is the largest river in Europe in terms of length, discharge and watershed. Some of world's largest reservoirs are on the Volga.