Mammoth Cave National Park is a national park in south-central Kentucky, US. It encompasses portions of Mammoth Cave, the longest known cave system in the world. The park's 52,830 acres (21,380 ha) are located primarily in Edmonson County, with small areas extending eastward into Hart and Barren counties. The Green River runs through the park, with a tributary called the Nolin River feeding into the Green just inside the park.

Hart County is a county located in the south central portion of the Commonwealth of Kentucky. As of the 2020 census, the population was 19,288. Its county seat is Munfordville, its largest city is Horse Cave. Hart County is a prohibition or dry county.