So digging deeper, I supposed that those numbers surrounding the urls were coordinates on the globe. A simple sloppy bash one liner later and we have the following:
$ curl -s http://maps.google.com/maps/api/js?sensor=false|tr ',' '\n'|grep -E '([0-9]+\]+|\[+[0-9]+)'|tr -d ']['|head -n -2|tail -n +2|while read lat; do read long; echo "$(echo "scale=8;$lat / 10000000"|bc),$(echo "scale=8; $long / 10000000"|bc)"; done | sort | uniq
Open these in tabs. We see strange locations in the seas surrounding Korea, including a few locations on land.
Update: Mystery Solved! A commenter writes, “This is due to Korean law prohibiting exporting detailed maps outside of Korea. That’s why Google (and other companies like Yahoo) set up separate server in Korea for detailed Korean map tiles. Areas linked in this post are supposed to be Korean water and land frontiers. This is actually a legacy of cold war era.”