Mammoth Cave in Kentucky is the world's longest known cave system. The Jewel Cave system near Custer, South Dakota is ranked as the second longest known cave system.
60 inches found just south of rutland North Dakota in august 2010
Andes is the Longest mountain chain in south america.
Probably North and South Dakota and Alaska.
The Andes
Nebraska and South Dakota
The Amazon River in South America is the longest river in the world. Tennessee does not border it.
The world's longest river system is the Nile-Kagera River system that flows in eastern Africa. There is some suggestion that the Amazon-Ucayali-Apurimac system in South America may be the largest.
South America, the Andes
Longest - yes, largest - no, the Amazon River in South America is.
The Missouri River is the longest river in the United States. It travels through the states of Montana, North Dakota, South Dakota, Iowa, Nebraska, Kansas, and Missouri and then joins the Mississippi River.
The Missouri River is the longest river in the United States. Its length is 2,341 miles (3,768 kilometers). It is in Montana, North Dakota, South Dakota, Nebraska, Iowa, Kansas and Missouri.
The Amazon is the 2nd longest river, the Nile is the longest. The Amazon is the worlds largest quantity of fresh water & is in South America, principly in Brazil.