Cavanal Hill

Cavanal Hill, the World's Highest Hill, Elevation 1999 ft.
West on Witteville Dr., Poteau, Oklahoma
Exploring Oklahoma History
Wikipedia
Cavanal Hill (officially Cavanal Mountain according to the US Geological Survey) located at Poteau, Oklahoma is billed as the tallest hill in the world at 1,999 feet (609 meters), based on the idea that it would be classified as a mountain if it were 2,000 feet or higher.
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* GPS Coordinates from other source