@Flick Having tootled around the mid Atlantic rift on a visit to Iceland, I can indeed confirm it is in the middle.
You need a Peters projection map. It’s amazing how small the countries near the equator look and how huge the ones near the pole look on a Mercator projection.
Without googling, and assuming this is a “trick question”, I would guess Canada as 3rd largest just for this reason - Mexico might actually be larger.