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The largest liquid reserve is the Great Lakes with roughly 20% of the world supply.
The largest overall reserve is Antarctica with 70% of the planet's fresh water tied up in snow and ice.
You did not specify if you are talking about USA or worldwide and if you are talking about natural reservoirs or mand made reservoirs. Lake mead is cosidered as the largest fresh water reservoir in USA.
Although not readily available, glaciers and ice contain the greatest amount of freshwater on earth at about 2.1 percent of the 4 percent total freshwater on earth.
The reservoir which holds the most fresh water is actually groundwater. A person digging down into the ground eventually reaches water. That is how a well is formed.