Which biogeographical regions are considered?

Mexico, China and Indonesia belong each one to two different regions, for more details about the states/provinces distribution see their respective pages:

http://www.hbw.com/geo/mexico-northern
http://www.hbw.com/geo/mexico-southern

http://www.hbw.com/geo/china-northern
http://www.hbw.com/geo/china-southern

http://www.hbw.com/geo/indonesia-except-west-papua
http://www.hbw.com/geo/west-papua-indonesia

You can find the complete country information in:

http://www.hbw.com/geo/r-mexico-global
http://www.hbw.com/geo/r-china-global
http://www.hbw.com/geo/r-indonesia-global