the.com/seaboard

The coast, but with a suit on — land's fancy term for where it ends.

means The strip of land lying along a coastline, especially when speaking of a whole region such as 'the Eastern Seaboard.'

from A straightforward compound from 'sea' plus 'board,' where 'board' carries its old sense of 'side' or 'edge' — the same sense preserved in nautical talk like 'inboard,' 'outboard,' and 'starboard.' Put together, it literally means the side or edge bordering the sea, a usage that settled into English by the 18th century.

origin
literally sea plus board, as in edge or side
usage
mostly paired with eastern or western
not a beach
refers to whole coastal region, not sand
vibe
sounds nautical, means real estate
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