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Enemy Military units become slower when approaching the immediate vicinity of Mills, Estates, Farms, Rice Paddies and Fields.
—In-game description

Berber Ghorfas is a technology in Age of Empires III: Definitive Edition - The African Royals that can be researched at a Trading Post built on a Berber settlement. Once researched, it gives Mills, Estates, Farms, Rice Paddies, and Fields an aura that reduces the speed of enemy military units by 30%.

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