In geographical context, a “Garben” is a:

Answer: [A] fault-block mountain

Horst and graben refer to regions that lie between normal faults and are either higher or lower than the area beyond the faults. While a horst represents a block pushed upward relative to the blocks on either side by the faulting, and a graben is a block generally long compared to its width that has been lowered relative to the blocks on either side due to the faulting. 

This question is a part of GKToday's Integrated IAS General Studies Module