Biogeography is the science of where species reside in physical space. What species live in that country? Do we have that snake in this state? Where do we find caecilians? Where did that frog come from? These are all questions of biogeography.
The following links will provide you with checklists or guides to the reptiles and amphibians of the particular state, province, or country given.
Look up herps by State or Province.
Look up herps by Country.