Pakistan has the world's largest canal based irrigation system
Amazon river system.
If by water system you mean a river system, then the Amazon River system of South America is the largest.
Mississippi
The world's largest river system is not the Nile. It is the Amazon River.
The Mammoth Cave system, located in Kentucky, is the largest cave in the world.
The Great Barrier Reef is the largest reef system in the world.
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amazon river
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.
The Russia Tower is the largest building in the world with natural ventilation system. It measures 2,009 ft. tall.
Peoria, Illinois