Russia is a country that is both in Europe and in Asia. The border is the Ural Mountains and Ural River. By geography, about twenty-five percent of the surface is in Europe, and seventy-five percent is in Asia. By population, about 110 million of the 144 million people, or 77%, live in the European part. The European part makes up 35 % of the surface of Europe. In the European part of Russia, there are 27.5 people per square kilometer. The Asian part has 22 % of the population, which means there are 2.5 people per square kilometer.