The primary source of fresh water on Earth is glaciers and polar ice caps. Together, they contain about 68.7% of the Earth's fresh water. These vast ice formations, primarily located in Greenland and Antarctica, store significant amounts of water that, when melted, can contribute to rising sea levels and freshwater availability. Other sources of fresh water include rivers, lakes, and underground aquifers, but glaciers remain the largest reservoir. Understanding the dynamics of glacier melt is crucial for water management, especially in regions relying on glacial runoff for drinking and irrigation.