If by water system you mean a river system, then the Amazon River system of South America is the largest.
The Mammoth Cave system, located in Kentucky, is the largest cave in the world.
Largest water tower in the world is in McBee, SC and holds 1.2 million gallons of water.
The world's largest cave system is located in the state of Kentucky. The name of the cave system is Mammoth's Cave. The cave system is part of the national parks.
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the great lakes
The largest swimming pool located in any of the Noahs ark water park!!! I hear that it is the most awesomest water park in the world!!!!
Chilka Lake is located on India's east coast. It is actually a brackish water lagoon and is the second largest lagoon in the world.
The Nile River has large amounts of water.
The world's largest body of water is the Pacific Ocean between the west cost of the United States and the east coasts of Asia.
The Nile River in Africa is the Longest which would also be the largest in terms of water capacity
The Sahara desert is the largest in the world. It is located in Africa.
The largest desert in the world is the Antarctic Desert which is located in Antarctica.