Dalanjargalan (Mongolian: Даланжаргалан, Seventy happiness also Ulaantolgoi)) is a sum (district) of Dornogovi Province in south-eastern 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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