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The Collins River rises on the Cumberland Plateau in Grundy County, Tennessee near the town of Gruetli-Laager. The Plateau is here capped largely by resistant Pennsylvanian Period sandstones. The Collins drains the Savage Gulf, a State Natural Area administered by the Department of Conservation and generally regarded as one of Tennessee's finest wilderness areas. Initially flowing roughly westward, the Collins then turns more northwest and then largely northward, flowing into Warren County. Flowing near Cardwell Mountain, it receives the surface drainage which emanates from Cumberland Caverns. This cave, which developed in Mississippian Period limestone, is often considered to be one of the most extensive cavern systems in North America. It is open to the public during the travel season as a tourist attraction. Just below this point is the confluence with the Barren Fork River, a major tributary.