Which source is the most abundant supply of liquid fresh water?

The most abundant supply of liquid fresh water is found in glaciers and ice caps, particularly in Greenland and Antarctica, which hold about 68.7% of the world's freshwater. However, when considering readily accessible liquid fresh water, rivers and lakes are more pertinent, with lakes containing approximately 20% of the world's surface fresh water. Groundwater also represents a significant source, accounting for around 30.1% of fresh water, making it an essential supply for human use.