Mongolian largest sand dune Mongol Els stretches 300 km on the territory of Aldarkhan soum in Zavkhan province, Jargalant, Bayan-Uul, and Khukh Morit soum in Gobi Altai province. The sand dunes edge with 800 km Zavkhan River on its northern edge. There are several picturesque lakes along the long sand dunes such as Ereen Lake, Ajig Lake, Sangiin Dalai Lake, and Gun Lake. 349200-hectare area of Mongol Els was protected as a nature reserve since 2010 to keep its natural balance, protect its flora, and fauna. The sand dunes are partially vegetated and worshipped by the locals as it provides emergency feed for their animals in some dry summers. Sand waves of the Mongol Els dunes allow great photo opportunity.