Ulaanbaatar, previously anglicized as Ulan Bator, is the capital and most populous city of Mongolia. With a population of 1.6 million, it is the coldest capital city in the world by average yearly temperature. The municipality is located in north central Mongolia at an elevation of about 1,300 metres (4,300 ft) in a valley on the Tuul River. The city was founded in 1639 as a nomadic Buddhist monastic centre, changing location 28 times, and was permanently settled at its modern location in 1778.

Buddhism is the largest religion in Mongolia practiced by 51.7% of Mongolia's population, according to the 2020 Mongolia census. Buddhism in Mongolia derives much of its recent characteristics from Tibetan Buddhism of the Gelug and Kagyu lineages, but is distinct and presents its own unique characteristics.