In a survey of students from junior high through the undergraduate col
lege level, males consistently out-performed females on a test coverin
g map skills and physical, human, and regional aspects of geography. T
he gender gap was consistent across all four subfields. It widened wit
h increased education and was significant even after accounting for nu
merous personal information items that might have explained the differ
ence. This consistent performance difference involving the broad spect
rum of geographic knowledge argues against explaining the gender gap a
s symptomatic of differences in a single underlying factor such as map
skills or spatial abilities. Knowledge-based and nonknowledge-based e
xplanations for the gender difference are discussed.