The NBA has the cleanest map of all the sports leagues.
Sports league have historically used geographic references to describe their league, conference or divisions (This was just one of the many reasons I was so appalled that San Diego State was going to join the Big East. Thankfully that plan was stymied). To have successful rivalries, teams often play up local proximity of fan bases (Yankees/Red Sox, Duke/North Carolina, Michigan/Ohio State) to add intensity to the on-field action. Given that teams and fans travel, the logistics make regionally based division economically prudent. This map (and the full set of major professional leagues in North America) shows that the NBA has the most geographically consistent divisions.
See on www.businessinsider.com
GEOGRAPHY EDUCATION 
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