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The Hidden Hollow is a heavily guarded cave^{[9, 46.1]}

behind the cathedral and harbor of Onslaught Harbor off the western coast of Icecrown. Grand Admiral Barean Westwind, leader of the Scarlet Onslaught resides in here.

v • d • e Subzones of Icecrown Aldur'thar: The Desolation Gate · The Argent Vanguard · Argent Tournament Grounds (Argent Pavilion · The Argent Valiants' Ring · The Aspirants' Ring · The Alliance Valiants' Ring · The Horde Valiants' Ring · The Ring of Champions · Silver Covenant Pavilion · Sunreaver Pavilion) · Balargarde Fortress · Battlescar Spire · Blackwatch · The Bombardment · The Breach · The Broken Front · Cathedral of Darkness · The Conflagration · Corp'rethar: The Horror Gate · The Court of Bones · The Crimson Cathedral · The Crimson Dawn · Crusaders' Pinnacle · Death's Rise · Deathspeaker's Watch · First Legion Forward Camp · The Fleshwerks · Halls of the Ancestors · The Hidden Hollow · Icecrown Citadel (The Frozen Halls) · Icecrown Glacier · Ironwall Dam · Ironwall Rampart · Jotunheim · Kul'galar Keep · Malykriss: The Vile Hold · Mord'rethar: The Death Gate · Naz'anak: The Forgotten Depths · Njorndar Village · Onslaught Harbor · The Pit of Fiends · Quel'Delar's Rest · Rise of Suffering · Sanctum of Reanimation · Saronite Mines · Savage Ledge · Scourgeholme · The Shadow Vault · Silent Vigil · Sindragosa's Fall · The Silver Blade · Ufrang's Hall · The Underhalls (The Circle of Suffering · Hall of Horrors) · Valhalas · Valley of Echoes · The Valley of Fallen Heroes · The Valley of Lost Hope · Weeping Quarry · Ymirheim Icecrown category