At 1,564,116 square kilometers (603,909 sq mi), Mongolia is the 18th largest country in the world by land mass and has a population of around three million people. It is also the world's second-largest landlocked country behind Kazakhstan and the largest landlocked country that does not border a closed sea. The country contains very little arable land, as much of its area is covered by grassy steppe, with mountains to the north and west and the Gobi Desert to the south. Ulaanbaatar, the capital and largest city, is home to about 40%-45% of the country's population.