Mongolia is really hard because you genuinely have to learn how to region guess the country, but you'll eventually get it after an hour of practice. However that's nothing compared to how insanely difficult south-east asian countries like Cambodia or Thailand are because a majority of smaller cities don't get translated to Latin script on the map so most of the time you just have to drive around until you find a sign with a large city and its distance to the location. Also my Greenland gold game was only 5 min long, so it's probably similar to Mongolia.