土拉河
Ulaanbaatar (; , , "Red Hero"), formerly anglicised as Ulan Bator, is the capital and most populous city of Mongolia. The municipality is located in north central Mongolia at an elevation of about in a valley on the Tuul River. The city was originally founded in 1639 as a nomadic Buddhist monastic centre, changing location 28 times, and was permanently settled at its current location in 1778.