* The Earth's center is a point, not a location on the surface. The center of the Earth is the geometric center of the sphere, not a specific country.

* The Earth is not a perfect sphere. It's slightly flattened at the poles and bulging at the equator. This means the geometric center isn't exactly aligned with any point on the surface.

So, while you can imagine a line extending from the Earth's center straight up to the surface, it would pass through different countries depending on where you choose to draw that line.