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.
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?
And that's just off the top of my head!