I am literally in dead center lower 48 USA. I guess I am 800 or 900 miles away from both Canada and Mexico.
Islands don't have borders, they only have territorial limits in the ocean.
The closest places to Taiwan are Okinawa, the Philippines and mainland China, all about equally distant. That said, only the Japanese island is worth visiting. Anything else, I have to fly further.
As for where I was born and lived in Canada until a decade ago, about 500km from the US. I haven't been home since.
I'm about 15 minutes from Canada.
I'm an eight hour drive to Mexico. I-35 goes right to Laredo.
15 minutes to Canada
4 hours to Mexico border.........TJ
I'm about 15 minutes away from the border over to England >_>
I am only 6 miles from Canada I can almost see it from my front porch
Central America, but it's hundreds of miles away.
I'm pretty close to Canada....about 30 miles!
About 300 miles away from Canada.
I'm closest to Mexico. A few states away.