The Green River, as seen from an over look on Green River Bluffs Trail, is the central force in the creation of Mammoth Cave, pictured in Mammoth Cave National Park near Cave City, Ky., on Wednesday, November 2, 2005. From a trail marker: "In the Mammoth Cave area, the Green River's tributary streams flow underground for miles, dissolving a maze of cave passages as they travel." The river is also a resource for humans and wildlife in the region. David Stephenson/Staff
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