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Ohio River, Gallatin County, Kentucky, 25702, United States of America (38.78779 -84.81013)
The river then follows a roughly southwest and then west-northwest course until Cincinnati, before bending to a west-southwest course for most of its length. The course forms the northern borders of West Virginia and Kentucky; and the southern borders of Ohio, Indiana and Illinois, until it joins the Mississippi River at the city of Cairo, Illinois. Where the Ohio joins the Mississippi is the lowest elevation in the state of Illinois, at 315 feet (96 m).
Mammoth Cave National Park, Union Light Road, Edmonson County, Kentucky, 42259, United States of America (37.18417 -86.12299)
Coordinates: 37.09770 -86.26775 37.27045 -86.02380 - Minimum elevation: 442 ft - Maximum elevation: 1,073 ft - Average elevation: 689 ft
Highgate Springs, Louisville, Jefferson County, Kentucky, 40218, United States of America (38.21516 -85.64742)
Coordinates: 38.19516 -85.66742 38.23516 -85.62742 - Minimum elevation: 465 ft - Maximum elevation: 660 ft - Average elevation: 538 ft