The oldest beaches in the world are beaches with white sand, such as Florida (Gulf Coast), Jamaica, etc.
Chinese Paddlefish
lake
About 3% of the water on Earth is fresh. Only about .1% of the fresh water is visible on land. About 75% of the fresh water is locked in glaciers and ice caps. Then about 24.9% of the fresh water is underground.
The Caspian Sea is the Worlds largest salt-water lake.
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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 great lakes
Lake Tanganyika
lake supior
"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
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.
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.