The following is a list of the longest caves in the United States per length (over 50 kilometres or 30 miles) of documented passageways. Many passageways are still being discovered; this list …

Welcome to Mammoth Cave in Kentucky, the world’s longest known cave system, brimming with 426 miles of surveyed passageways that twist and turn into the depths of the Earth.

Sep 30, 2025 · Rolling hills, deep river valleys, and the world's longest known cave system. Mammoth Cave National Park is home to thousands of years of human history and a rich …

Oct 21, 2025 · Do not ask for cave locations, I will not give them out. Type: CT=Chalk & Tufa & Laterite , C=Conglomerate & Schist, G=Gypsum, L=Lava, Q=Sandstone & Quartzite, S=Salt, …

Oct 4, 2022 · Situated in Kentucky, Mammoth Cave lives up to its name as the world’s longest cave system, spanning over 400 miles of explored passages. Its labyrinthine network of …

Jul 19, 2025 · Mammoth Cave, located in Kentucky, is the world’s longest cave system, with over 400 miles of explored passageways. Its vast chambers and intricate limestone formations …

Oct 15, 2025 · Carlsbad Caverns is one of the most iconic cave systems in the United States, renowned for its size, beauty, and remarkable mineral formations. The cave developed within …

Apr 13, 2025 · What Makes Mammoth Cave the Biggest Cave in the US? Mammoth Cave is the largest cave system in the United States due to its extensive network of interconnected …

Nov 11, 2025 · Mammoth Cave National Park in Kentucky is home to the world's longest-known cave, which stretches over 400 miles in length. While exploring the cave system on guided or …

It encompasses portions of Mammoth Cave, the longest known cave system in the world. The park's 52,007 acres (21,046 ha) are located primarily in Edmonson County, with small areas …