seaboard

1. N-COUNT The seaboard is the part of a country that is next to the sea; used especially of the east coast of North America. (尤指北美東海岸的)沿海地區(qū)[usu 'the' N in sing]

...the Eastern seaboard of the U.S. ...美國(guó)東部沿海地區(qū)。