With the exception of the provinces which border on the caucasus, all Russia is prairie-like in surface.
"Due North or Glimpses of Scandinavia and Russia"
Maturin M. Ballou
The Circassians in caucasus, the Tshuktshi Koriaks in North-eastern Asia, and the Kaffres in Africa, show this.
"The Ethnology of the British Colonies and Dependencies"
Robert Gordon Latham
These are the beginnings of the caucasus mountains, and from the photograph we may measure as follows the height to which they rise above the surrounding level of the moon: Fig.
"A Text-Book of Astronomy"
George C. Comstock