It appears we're we assuming that each post has only one geolocation? That seems like the old days of WP when each post could only have one category. A lot of the geographically relevant writing mentions multiple locations in a single post ("had lunch in X, got a flat tire an hour later near Y, got a ride to Z and fixed it…"). Misterbisson 12:31, 23 April 2012 (UTC)
http://lists.automattic.com/pipermail/wp-hackers/2010-June/032305.html