Here is a link to the group list as of today. You will see that the groups are named for mountains. I will give a lollipop to each child who can tell me which country (and for the U.S., which state) each mountain is in.
http://spreadsheets.google.com/ccc?key=0AtJbsJzdGmDKdE01ZndDZ2p3N0xzVmg3VnVoWXh2dHc&hl=en