4 caches total. 1 cache from any 4 of these "Corners of the Earth"
Corner 1:
Canada, United States, Mexico, Puerto Rico, Bermuda, Costa Rica, Bahamas, Panama, Dominican Republic, Cuba, El Salvador, Belize, Cayman Islands, US Virgin Islands, Trinidad and Tobago, Guatemala, Curacao, Aruba, Barbados, Bonaire, British Virgin Islands, Honduras, Saint Kitts and Nevis, St Kitts, Nicaragua, Netherlands Antilles, Jamaica, Antigua and Barbuda, Bonaire, Turks and Caicos Islands, Martinique, Guadeloupe, Haiti, Saint Vincent and the Grenadines, Grenada, Saint Lucia, Anguilla, Montserrat, Dominica, Saint Barthélemy, Saint Pierre, St. Martin Miquelon, St Eustatius
Corner 2:
Germany, United Kingdom, Sweden, France, Czechia, Austria, Norway, Denmark, Spain, Finland, Netherlands, Portugal, Switzerland, Belgium, Italy, Slovakia, Ireland, Poland, Hungary, Luxembourg, Slovenia, Latvia, Lithuania, Greece, Romania, Estonia, Croatia, Bulgaria, Cyprus, Isle of Man, Iceland, Russia, Ukraine, Serbia, Jersey, Guernsey, Liechtenstein, Malta, Faroe Islands, Aland Islands, Andorra, Bosnia and Herzegovina, Greenland, Montenegro, Macedonia, Albania, Armenia, Svalbard and Jan Mayen Islands, Monaco, Belarus, Gibraltar, Moldova, San Marino, Vatican City State
Corner 3:
Brazil, Chile, Argentina, Colombia, Ecuador, Peru, Venezuela, Bolivia, Suriname, Paraguay, Uruguay, Falkland Islands, French Guiana, Guyana, South Georgia and the South Sandwich Islands
Corner 4:
South Africa, Egypt, Namibia, Kenya, Morocco, Réunion, Tunisia, Zimbabwe, Tanzania, Swaziland, Botswana, Mauritius, Seychelles, Cabo Verde, Mozambique, Zambia, Uganda, Angola, Gambia, Ghana, Djibouti, Malawi, Ethiopia, Senegal, Algeria, Lesotho, Libya, Madagascar, Mauritania, Mali, Nigeria, Sudan, British Indian Ocean Territory, Mayotte, Cameroon, Congo, Niger, Saint Helena, Sao Tome and Principe, Gabon, Rwanda, Sierra Leone, South Sudan, Benin, Equatorial Guinea, Togo, Burkina Faso, Democratic Republic of the Congo, Burundi, Comoros, Eritrea, Chad, Côte d'Ivoire, Cape Verde
Corner 5:
Japan, South Korea, Thailand, Israel, Hong Kong, Taiwan, Turkey, United Arab Emirates, China, Singapore, Qatar, Malaysia, Afghanistan, Iraq, Saudi Arabia, India, Oman, Indonesia, Kuwait, Mongolia, Philippines, Vietnam, Sri Lanka, Jordan, Lebanon, Nepal, Iran, Bahrain, Timor-Leste, Cambodia, Kyrgyzstan, Georgia, Kazakhstan, Myanmar, Maldives, Azerbaijan, Bhutan, Pakistan, Macao, Laos, Uzbekistan, Syria, Tajikistan, Palestine, Bangladesh, Brunei, Turkmenistan, Christmas Island, Yemen, China, Macao Special Administrative Region
Corner 6:
Australia, New Zealand, Guam, Fiji, New Caledonia, Niue, N. Mariana Islands, Palau, French Polynesia, Micronesia, Marshall Islands, Vanuatu, Cook Islands, Papua New Guinea, Norfolk Island, Samoa, American Samoa, Kiribati, US Minor Outlying Islands, Nauru, Solomon Islands, Tuvalu
Corner 7:
Antarctica.