Dalanjargalan (, 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 (Ulaanbaatar - Beijing) line and abandoned Soviet air force base location. Eldev Coal Mine is 21 km N from sum center. In 2009, its population was 2,554.Statistics office of Dornogovi Aimag/ Report 2009
Geography The district has a total area of 4,100 km2.
Administrative divisions The district is divided into five bags, which are: Bichigt Eldev Olon-Ovoo Tsomog Ungut
Education The district has a secondary school, primary school and kindergarten. The gross enrolment ratio for secondary school is 77.5% and for primary school is 92.4%.
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