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|Time zone||UTC + 8 (UTC+8)|
Dalanjargalan (Mongolian: Даланжаргалан, Seventy happiness) is a sum (district) of Dornogovi Province in southeastern Mongolia. Sum center is Olon Ovoo railway station on Trans-Mongolian Railway(Ulan Bator - Beijing) line and abandoned Soviet air force base location. Eldev Coal Mine is 21 km N from sum center.
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