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This extinct volcano lies near the road, and stretches from Bulgan town to Moron, administrative city of Huvsgul province for 80 kilometers northwest of Bulgan town through the territory of Kutag- Undur Soum. The reserve occupies a territory of 8 square kilometers with an elevation of 1,686 meters above sea level. It has been protected since 1965, and today enjoys the statue of “ Natural Monument ”.
The main road separates this sand dune into two parts, Mongol Els on the south and Khugnu Tarnyn Els on the north. The sand is sodden under its surface, so shrubberies such as willow, elm and dogwood, grow in the area. There are many tourist camps around the sight. Elsen Tasarkhai is surrounded by Mount Khugnu Khan on the north and Mount Ikh Mongol on the south.
Ongi Monastary is the ruin of a big monastery on the bank of the Ongiin River. Ongi monastery has 28 temples and other buildings on the south slope of the Rocky Mountain like Balsa country and stupas which are not broken. Ongi monastery had about 1000 lamas and it was destroyed during the Stalinist purges in 1930s.The ruins of Ongi Temple are found in Saikhan Ovoo soum of Dundgobi (Middle Gobi) province. It used to be a big Buddhist monastery compound built by Bari Yonzon Khamba Lamaist bishop at the Ongi river, a river that takes source from the Khangai Mountain range in Ovorkhangai Aimag (Province) and flows into the Ulaan Nuur Lake of Gobi.