marginal sea

[ mahr-juh-nl see ]
/ ˈmɑr dʒə nl ˈsi /

noun

water that lies alongside a state, falls under its authority, and extends about 3.5 statute miles (6 kilometers) from the coast.

Origin of marginal sea

First recorded in 1805–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020