Name five countries on the prime meridian?

1. United Kingdom: The prime meridian passes through the Royal Observatory in Greenwich, London, which is considered the birthplace of Greenwich Mean Time (GMT).

2. France: The prime meridian passes through the Paris Observatory, located just south of Paris.

3. Spain: The prime meridian crosses mainland Spain in the municipality of Castellón de la Plana, located in the southeastern part of the country.

4. Algeria: The prime meridian runs through eastern Algeria, passing near the coastal city of Annaba.

5. Mali: The most southernly country that the prime meridian crosses, going directly through capital city of Bamako.