In Canada, you have three choices. British Columbia/Vancouver, Ontario/Ottawa, and Quebec/Montreal. The rest is frozen tundra.
Russia? Leningrad (or whatever they're calling it now), Moscow, and the Black Sea region (might as well go to Ukraine/Odessa for that). The rest is frozen tundra.
So yeah, China and India. It's not about size. It's about the diversity of cultures and climates.
And that's just off the top of my head!
edit: From the cia world factbook(https://www.cia.gov/library/publications/the-world-factbook/...) China Ethnic groups: Han Chinese 91.5%, Zhuang, Manchu, Hui, Miao, Uighur, Tujia, Yi, Mongol, Tibetan, Buyi, Dong, Yao, Korean, and other nationalities 8.5% (2000 census)
Yep.. that's a real melting pot there.
For instance, where's Canada's desert? Its jungle?