Its surface is a plane furrowed by beds of streams, lakes, seas and oceans, and bulged by mountains and hills, which in turn are
раёны Ўсходняй Эўропы, Каўказ, Сярэдні Ўрал, горы Заходняй і Ўсходняй Сібіры, Далёкі Ўсход, Камчатка [2-5].