Trans-Siberian Railroad is the longest continuous railroad in the world, extending over 5,600 miles (9,000 kilometers). It stretches across the width of Russia, from Moscow in the west to Vladivostok at the far southeastern tip of the country. The trip from one end to the other takes about six or seven days. Most of the railroad crosses Siberia, the vast, icy region that makes up most of the Asian part of Russia.