The Grand Canyon Caverns (Havasupai: Ŧathiil Ñwaʼa or Ŧathiil Ñhaʼa,[1]35°31′44″N113°13′54″WCoordinates: 35°31′44″N113°13′54″W), located just a few miles east of Peach Springs, Arizona, lie 210 feet (64 m) below ground level. They are among the largest dry caverns in the United States. Dry caverns compose only 3% of caverns in the world. Because of the lack of water, stalagmites and stalactites are rare in the caverns. Air comes into the caverns from the Grand Canyon through 60 miles (97 km) of limestone caves, a fact discovered when red smoke flares were ignited in the caves, and two weeks later, red smoke was seen protruding from vents, near Supai, Arizona, in the Grand Canyon.