I sense a real problem with this in that you're going to have quite a few days like today where the answer is a single really obvious country.
Spain.
(, Mon 6 Nov 2023, 10:38, Reply)
as there are fewer countries than days in a year.
I guess they could incorporate historical maps of the world and fictional maps from Trek Wars, Dungeons and Harry Potters of the Rings and such-like.
(, Mon 6 Nov 2023, 14:23, Reply)
(, Mon 6 Nov 2023, 19:34, Reply)
So that leaves about 163 countries repeating about 2.2 times per year.
(, Mon 6 Nov 2023, 23:19, Reply)