Start in Belgium and continue clockwise (towards northeast) from there, naming every country you would pass through on your way along the coast. Some countries appear more than once.
IMPORTANT NOTE: once you have completed Eurasia/Africa, you will be transported magically from metropolitan France to French Guiana. Continue clockwise from there. Ignore the Panama and Suez canals, as well as any bridges. Coastline lengths are for the segment you are traversing, not the total length for a given country.