This is the 7661st most frequent Russian word.
забайкальский
Relating to the region beyond Lake Baikal in Siberia.
'забайкальские' is used as an adjective meaning 'of or pertaining to Transbaikalia' describing the steppes as being located in that region.
Я хочу посетить забайкальские степи на каникулах.
I want to visit the Transbaikalian steppes during the holidays.
'Забайкальская' is utilized as an adjective modifying 'природа', highlighting the natural features of the Transbaikalia region.
Забайкальская природа славится своей уникальностью.
The Transbaikalian nature is famous for its uniqueness.
'Забайкальском' here is a locative form of an adjective that refers to the administrative region of Transbaikalia, connecting the location to a specific geopolitical unit.