In the Ridge and Valley Province of the Appalachians, the ridges are anticlines and the valleys are synclines.

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In the Ridge and Valley Province of the Appalachians, the ridges are typically formed by erosion-resistant rocks that were uplifted in anticlines, while the valleys are often underlain by softer rocks that were downwarped into synclines, but the actual topography can be more complex due to the folding and faulting processes, with some ridges formed over synclinal structures and valleys over anticlines due to differential erosion.

In the Ridge and Valley Province of the Appalachians, the Ridges