119.8 sq miles (310.3 km²).
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Delicate Arch is located in Arches National Park in Utah, USA. It is one of the most iconic and well-known natural arches in the world. The arch is made of Entrada sandstone and stands about 65 feet tall. It is a popular tourist attraction and is often photographed against the backdrop of the beautiful Utah desert landscape.
Over 400 miles of passageways have been mapped and surveyed in Mammoth Cave National Park, making it the world's longest known cave system. Extensive exploration and mapping efforts have been ongoing to document the complex network of underground passages and chambers.
Meriwether Lewis was buried near the Natchez Trace Parkway in Tennessee, close to where he died at Grinder's Stand. His gravesite is now a historic landmark maintained by the National Park Service.
The state with the largest cave system in the United States is Kentucky. The Mammoth Cave National Park in Kentucky is home to the world's longest known cave system, with over 400 miles of explored passageways.
US Congress changed the designation and the name of Carlsbad Cave National Monument, created in 1923, to Carlsbad Caverns National Park in 1930. Carlsbad Cavern, without the "s", is the name of the main tour cave. There are 117 caves known in the park.