28 selected
- Not filled in
- Cambodia
- Cameroon
- Canada
- Cape Verde
- caribbean
- Cayman Islands
- Central African Republic
- Chad
- Chili
- China
- China - Beijing
- China - Fujian
- China - Guangdong
- China - Hubei
- China - Shanghai
- China - Xiamen
- Christmas island
- Colombia
- Comoros
- Congo Brazzaville
- Congo Kinshasa
- Cook islands
- Costa Rica
- Croatia
- Cuba
- Curaçao
- Cyprus
- Czech Republic