A type of fortified wall or barrier built across a mountain pass or valley to control passage and trade routes, historically used in the Caucasus region.
From Persian 'dar' (gate/door) and 'band' (barrier/dam), literally meaning 'gate barrier.' The word reflects medieval fortification terminology used along the Silk Road and Caucasian trade routes.
The word perfectly captures how geography shaped geopolitics—these weren't just walls but economic chokepoints where empires literally controlled who could trade what, making a single structure worth more than a thousand soldiers.
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