Yeah, I figured Canada and the US would be an obvious guess:
The Aroostook Valley Country Club on the New Brunswick (Canada) and Maine (USA) border. The peculiarity of this course is that even though it’s technically entirely on the Canadian side, Canadians have to pass through the border for access because both the parking lot and pro shop are on the American side.

https://maps.google.ca/maps?q=aroost...15000&t=h&z=15


The other two countries are not as obvious. Not the UK and the Republic of Ireland