The Dranosh'ar Blockade is a massive fortification in Durotar just outside Orgrimmar .

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The Dranosh'ar Blockade, Durotar

The Dranosh'ar Blockade is used as a defence for Orgrimmar but also is used to train troops and build war machines. There is also a dock in Bladefist Bay where ships can dock to take troops to battlefronts around the world.