The largest glacier in the world is the Antarctic Ice Sheet, which covers around 1.4 million square kilometers. While there are many glaciers within this vast ice sheet, it is the Antarctic Ice Sheet as a whole that holds the title. It contains about 60% of the world's fresh water and plays a critical role in regulating global sea levels. The ice here is hundreds of thousands of years old, holding valuable data about Earth's climate history. As climate change continues to impact it, monitoring this glacier is essential to understand future sea level rise.