| Set of countries | Country they all border |
| Belize, Guatemala, USA | |
| Austria, France, Slovenia | |
| Poland, Romania, Russia | |
| Greece, Romania, Serbia | |
| Estonia, Finland, Norway | |
| Afghanistan, Iraq, Pakistan | |
| China, Russia, Uzbekistan | |
| Georgia, Greece, Syria | |
| Bangladesh, Bhutan, Nepal | |
| China, Thailand, Vietnam | |
| | Set of countries | Country they all border |
| Azerbaijan, Mongolia, North Korea | |
| Brunei, Indonesia, Thailand | |
| Central African Republic, Egypt, Ethiopia | |
| Somalia, Tanzania, Uganda | |
| Benin, Cameroon, Niger | |
| Morocco, Niger, Tunisia | |
| Chile, Paraguay, Uruguay | |
| Bolivia, Chile, Colombia | |
| Ecuador, Panama, Venezuela | |
| Brazil, France, Guyana | |
|