Books on the broad subject of Geography can be found in the "G" call number area of the General Collection on the upper level, and the on Reference Collection on the lower level. Maps of the two floors can be found just a little bit down from here.
Some selected new books are highlighted here.
Many books on the Anthropology or Ethnography or Ethnology or Social / Cultural aspects of various ethnic / culture groups or countries / regions, will be found under other call numbers. Use the Library Catalog to search for these books by keyword.
One sample search might be something like: Africa AND geograph*
The asterisks at the end of the word are truncation features, and allow you to pick up variations of the word:
geography or geographies or geographic or geographical without having to type out separately all the variations of a word.
Outline of the Library of Congress Classification System (what COD uses to arrange its books on the shelves).