Tsagaan Agui cave is in Tsakhir mountain in Bayanlig sum of Bayankhongor province. This crystal cave is 40 meters long and is famous in the world by its beauty and trace of ancient people whom were living 700’000-800’000 years ago. Bedrock and large blocks of dolomite debris occur at depths of as much as four meters below the present surface of the cave interior. An open chimney in the roof of the main rotunda and the presence of sporadically active streams within the cave complex itself has allowed erosional episodes profoundly influencing the composition and distribution of the cave’s sediments. A wide range of mammalian and avian species has been identified thus far, many with important paleoecological implications, including the Chiru or Tibetan Antelope (Pantholops hodgsonii) which is currently restricted in its distribution to the Qinghai-Tibet Plateau, numerous rodents, and 17 species of birds including Saker Falcon
Tsagaan agui cave and Bichigt rock drawings are protected by Mongolian government since 1998.