Otuken

Ötüken was the capital of the Turkic Khaganate. Otugan was around Mongolia and Central Asia on the Khangan Plateau. Ötüken probably stretched "from the Khangai Range of Central Mongolia to the Sayan Mountains of Tuva [Siberia], at the centre of which is the Orkhon Valley". which for centuries was regarded as the seat of the imperial power of the steppes.
It was also an important place in Turkic mythology and Tengrism. Otukan means Mother Earth.