A circle is drawn from the center of The WORLD! The center of the world in this case is defined as 0,0 N and 0,0 E. Using a standard Mercator projection this is in the Gulf of Guinea as the picture shows.
It is 6679 km in radius (4150 miles). Which is a sixth of the circumference of the Earth.
What countries does it go through?
Only the countries that the 6679 km line goes through count.
For example: Benin does not count as it ranges from 716-1414 km.
For example: Jamaica does not count as it is more than 6679 km away.