Plural of graben; geological formations where a block of earth's crust has dropped down between two fault lines.
From German 'Graben' (meaning ditch or grave) + English plural '-s'; geological term adopted from German in the 1800s.
The Dead Sea is Earth's most dramatic graben—it's dropped so far that it's 1,410 feet below sea level, creating one of the planet's lowest land spots and strangest ecosystems.
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