The greatest source of freshwater on Earth is the Antarctic Ice Sheet, which contains approximately 60% of the world's freshwater. Located on the continent of Antarctica, this massive ice structure plays a critical role in global sea levels. When temperatures rise, melting glaciers release freshwater into the oceans, influencing marine ecosystems and weather patterns. Beyond the Antarctic Ice Sheet, other significant freshwater sources include rivers, lakes, and groundwater, but none match the sheer volume found in the Antarctic region.