Via approximately 80 entries, the SAGE 21st Century Reference Series volumes on geography highlights the most important topics, issues, questions and debates any student obtaining a degree in this field need to have mastered for effectiveness in the 21st century. The purpose is to provide undergraduate majors with an authoritative reference source that will serve their research needs with more detailed information than encyclopedia entries but not so much jargon, detail, or density as a journal article or a research handbook chapter.