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(formerly Maimachen), a city in the Mongolian People’s Republic, in Selenga aimak. The population is more than 2,000. Altan Bulak is located on the Chita (USSR)-Choibalsan (MPR) highway at the Mongolian-Soviet border, across from the town of Kiakhta (USSR). It has tanneries and other enterprises for processing stock-farm products.