This is the 3959th most frequent Russian word.
забайкалье
Transbaikalia; the region located to the east of Lake Baikal in Russia.
The word "забайкалье" refers to a geographical region in this sentence.
Забайкалье — это красивый край России.
Zabaikalie is a beautiful region of Russia.
Here, "забайкалье" refers to the people and cultural context of the region.
Местные жители Забайкалья любят делиться историями о своей богатой культуре.
Local residents of Zabaikalie love sharing stories about their rich culture.
In this usage, "забайкалье" denotes the physical and ecological aspects of the region.