Mount Kailash of south-western Tibet has been equated with Tagzig Olmo Lung Ring by some scholars. The Bonpo contend that this Tagzig Olmo Lung Ring is not a physical locality that can be visited by humans in the state of dualism. In order to access Tagzig Olmo Lung Ring, one must diligently practice spiritual disciplines, purify the bodymind and mindstream of all obscurations, and realise the non-dual state. Bonpo pray with the heartmind to take birth in Tagzig Olmo Lung Ring as this may only occur post-enlightenment. Mount Kailash is accessible by those in a dualistic and non-realised state and is therefore proof to the Bonpo that Mount Kailash and Tagzig Olmo Lung Ring are qualitatively and essentially, different realms. Historical Bon texts state explicitly that the sacred mountain of Mount Kailash is central to the kingdom of Zhangzhung.