Mongolia (country), country in East Asia, landlocked between Russia and China. The country’s capital and largest city is Ulaanbaatar (Ulan Bator), located in the heartland of Mongol civilization. For thousands of years Mongolia has been the homeland of ethnic Mongols, who make up 90 percent of the country’s people today. Mongols are traditionally nomadic animal herders, with complete freedom of movement, and many continue this way of life on the steppe, a swath of rolling grasslands extending across the country. Mongolia is a sparsely populated country, and domesticated animals outnumber people. Wild horses and many other animals also roam free on the steppe.