色楞格省
Altanbulag (, "golden spring") is a sum (district) of Selenge Province in northern Mongolia. It is located about 25 km from the provincial capital of Sükhbaatar, on the border with Russia opposite the town of Kyakhta. Altanbulag is the location of the Altanbulag Free Trade Zone (, "Altanbulag khudaldaany Chölööt büs").