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The Forest Preserve is a tile improvement that can be built upon the discovery of the Scientific Method. It adds happiness (and possibly commerce) to a tile and increases the chance that the forest or jungle will spread. It was added in Civilization IV: Beyond the Sword.

Civilization IV Improvements [edit]
Camp Cottage (Hamlet Village Town) Farm Fishing Boats Forest PreserveB Fort Lumbermill Mine Offshore Platform Pasture Plantation Quarry Roads and railroads Watermill Well Whaling Boats Windmill Winery Workshop
B Added in Beyond the Sword