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 5725 km in radius (3557 miles). Which is a seventh of the circumference of the Earth.
What countries does it go through?
Only the countries that the 5725 km line goes through count.
For example: Gambia does not count as it ranges from 2127-2368 km.
For example: Indonesia does not count as it is more than 5725 km away.