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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).
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: 142 m - Maximum elevation: 201 m - Average elevation: 164 m
Riverside Gardens, Louisville, Jefferson County, Kentucky, 40216, United States of America (38.19229 -85.87246)
Coordinates: 38.17229 -85.89246 38.21229 -85.85246 - Minimum elevation: 122 m - Maximum elevation: 300 m - Average elevation: 149 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: 135 m - Maximum elevation: 327 m - Average elevation: 210 m