What are the two major mountain ranges in Russia?

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Tags

1. #along
2. #russia
3. #principally
4. #system
5. #mountains
6. #complex
7. #located
8. #continental
9. #border
10. #eastern
11. #sayan
12. #altay
13. #mountain
14. #extremity
15. #siberia
16. #western
17. #southwestern
18. #mongolia
19. #caucasus
20. #ranges