almost.earth: all 252 selectable countries and territories
Only the listed places can be answers. Antarctica and unlisted regions provide geographic context.

1. Afghanistan
2. Åland
3. Albania
4. Algeria
5. American Samoa
6. Andorra
7. Angola
8. Anguilla
9. Antigua and Barbuda
10. Argentina
11. Armenia
12. Aruba
13. Australia
14. Austria
15. Azerbaijan
16. Bahrain
17. Bangladesh
18. Barbados
19. Belarus
20. Belgium
21. Belize
22. Benin
23. Bermuda
24. Bhutan
25. Bolivia
26. Bosnia and Herzegovina
27. Botswana
28. Brazil
29. British Indian Ocean Territory
30. British Virgin Islands
31. Brunei
32. Bulgaria
33. Burkina Faso
34. Burundi
35. Cambodia
36. Cameroon
37. Canada
38. Cape Verde
39. Caribbean Netherlands
40. Cayman Islands
41. Central African Republic
42. Chad
43. Chile
44. China
45. Christmas Island
46. Clipperton Island
47. Cocos (Keeling) Islands
48. Colombia
49. Comoros
50. Cook Islands
51. Costa Rica
52. Côte d’Ivoire
53. Croatia
54. Cuba
55. Curaçao
56. Cyprus
57. Czechia
58. Democratic Republic of the Congo
59. Denmark
60. Djibouti
61. Dominica
62. Dominican Republic
63. Ecuador
64. Egypt
65. El Salvador
66. England
67. Equatorial Guinea
68. Eritrea
69. Estonia
70. Eswatini
71. Ethiopia
72. Falkland Islands
73. Faroe Islands
74. Federated States of Micronesia
75. Fiji
76. Finland
77. France
78. French Guiana
79. French Polynesia
80. French Southern and Antarctic Lands
81. Gabon
82. Georgia
83. Germany
84. Ghana
85. Gibraltar
86. Greece
87. Greenland
88. Grenada
89. Guadeloupe
90. Guam
91. Guatemala
92. Guernsey
93. Guinea
94. Guinea-Bissau
95. Guyana
96. Haiti
97. Heard Island and McDonald Islands
98. Honduras
99. Hong Kong
100. Hungary
101. Iceland
102. India
103. Indonesia
104. Iran
105. Iraq
106. Ireland
107. Isle of Man
108. Israel
109. Italy
110. Jamaica
111. Japan
112. Jersey
113. Jordan
114. Kazakhstan
115. Kenya
116. Kiribati
117. Kosovo
118. Kuwait
119. Kyrgyzstan
120. Laos
121. Latvia
122. Lebanon
123. Lesotho
124. Liberia
125. Libya
126. Liechtenstein
127. Lithuania
128. Luxembourg
129. Macau
130. Madagascar
131. Malawi
132. Malaysia
133. Maldives
134. Mali
135. Malta
136. Marshall Islands
137. Martinique
138. Mauritania
139. Mauritius
140. Mayotte
141. Mexico
142. Moldova
143. Monaco
144. Mongolia
145. Montenegro
146. Montserrat
147. Morocco
148. Mozambique
149. Myanmar
150. Namibia
151. Nauru
152. Nepal
153. Netherlands
154. New Caledonia
155. New Zealand
156. Nicaragua
157. Niger
158. Nigeria
159. Niue
160. Norfolk Island
161. North Korea
162. North Macedonia
163. Northern Ireland
164. Northern Mariana Islands
165. Norway
166. Oman
167. Pakistan
168. Palau
169. Palestine
170. Panama
171. Papua New Guinea
172. Paraguay
173. Peru
174. Philippines
175. Pitcairn Islands
176. Poland
177. Portugal
178. Puerto Rico
179. Qatar
180. Republic of the Congo
181. Réunion
182. Romania
183. Russia
184. Rwanda
185. Saint Barthélemy
186. Saint Helena
187. Saint Kitts and Nevis
188. Saint Lucia
189. Saint Martin
190. Saint Pierre and Miquelon
191. Saint Vincent and the Grenadines
192. Samoa
193. San Marino
194. São Tomé and Príncipe
195. Saudi Arabia
196. Scotland
197. Senegal
198. Serbia
199. Seychelles
200. Sierra Leone
201. Singapore
202. Sint Maarten
203. Slovakia
204. Slovenia
205. Solomon Islands
206. Somalia
207. South Africa
208. South Georgia and the South Sandwich Islands
209. South Korea
210. South Sudan
211. Spain
212. Sri Lanka
213. Sudan
214. Suriname
215. Svalbard and Jan Mayen
216. Sweden
217. Switzerland
218. Syria
219. Taiwan
220. Tajikistan
221. Tanzania
222. Thailand
223. The Bahamas
224. The Gambia
225. Timor-Leste
226. Togo
227. Tokelau
228. Tonga
229. Trinidad and Tobago
230. Tunisia
231. Türkiye
232. Turkmenistan
233. Turks and Caicos Islands
234. Tuvalu
235. Uganda
236. Ukraine
237. United Arab Emirates
238. United States
239. United States Minor Outlying Islands
240. United States Virgin Islands
241. Uruguay
242. Uzbekistan
243. Vanuatu
244. Vatican City
245. Venezuela
246. Vietnam
247. Wales
248. Wallis and Futuna
249. Western Sahara
250. Yemen
251. Zambia
252. Zimbabwe