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the Great Lakes are fresh water.( the largest fresh water lakes in the world.)
Sandbanks Provincial Park, near belleville Ontario Canada
The great lakes
"The Antarctic Icecap is the largest supply of fresh water, representing nearly 2% of the world's total of fresh and salt water." Source: http://www.infoplease.com/ipa/A0004674.html
the great lakes
Lake Tanganyika
lake supior
Lake Superior is the world's largest fresh water lake
There are 25% of freshwater in the Great Lakes
If by water system you mean a river system, then the Amazon River system of South America is the largest.
The largest amount (by volume) of freshwater above ground is Lake Baikal in Russia. It contains about 20% of the surface freshwater. However, almost all of the world's freshwater is underground.
Lake Baikal a lake of south-central Russia is the world's largest freshwater lake in terms of volume. It contains about 5521 cubic miles of water (23,000 cubic kilometers), or approximately 20% of Earth's fresh surface water. This is a volume of water approximately equivalent to all five of the North American Great Lakes combined.The largest body of liquid surface fresh water on Earth by area is Lake Superior, between the north-central United States and southern Ontario, Canada.