I’ve been to four on this list (1, 4, 5, and 8).
- Maldives, 2.4 meters, Indian Ocean
- Tuvalu, 5 meters, South Pacific Ocean
- Cocos Islands, 5 meters, Indian Ocean
- Marshall Islands, 10 meters, North Pacific Ocean
- Cayman Islands, 46 meters, Caribbean Sea
- Turks & Caicos, 49 meters, North Atlantic/Caribbean Sea
- Gambia, 53 meters, Africa
- Bahamas, 63 meters, North Atlantic/Caribbean Sea
- Anguilla, 65 meters, Caribbean Sea
- Niue, 68 meters, South Pacific
- Nauru, 71 meters, South Pacific
- Vatican, 75 meters, Europe
- Kiribati, 83 meters, South Pacific