Grey Glacier is a stunning blue ice tongue descending from the Southern Patagonian Ice Field - the world's third-largest freshwater reserve. Brilliant blue icebergs float on Lago Grey, and massive chunks regularly calve from the glacier wall. Approach by 3-hour boat cruise through floating ice, kayak among icebergs, or ice hike on the glacier itself with specialized guides. The milky turquoise lake and towering ice walls create an otherworldly landscape that brings climate change into sharp focus.