graben
noun
gra·ben ˈgrä-bən 
: a depressed segment of the crust of the earth or a celestial body (such as the moon) bounded on at least two sides by faults
Example Sentences
Recent Examples on the Web Germany’s Vulcan Energy believes this unusual geological formation, known as a graben, is the key to sustainably producing thousands of tons of the chemically reactive metal needed to power zero-emission cars. 
Christiaan Hetzner, Fortune, 11 Dec. 2021
Christiaan Hetzner, Fortune, 11 Dec. 2021 Word History
Etymology
German, ditch, from Old High German grabo, from graban to dig — more at grave entry 5
First Known Use
1896, in the meaning defined above
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