Definitions for land bridge
Random House Webster's College Dictionary
an actual or hypothetical strip of land that connects adjacent continental landmasses and serves as a route of dispersal for plants and animals.
Origin of land bridge:
in biogeography: an isthmus or other land connection between what at other times are separate land masses
Travel by ferry from one country, via another country by road, then by another ferry crossing to a third country. An example is from Ireland by ferry to the UK, by road to the opposite coast, then ferry to France.