A stream carrying bright orange silt meets the North Atlantic Ocean near the town of Hvolsvöllur, Iceland. Many tributaries like this one can be seen along the southern coast of the country, fed by several massive glaciers and glacial lakes further inland. Roughly 11% of Iceland’s land area is covered by glaciers, the largest of which — Vatnajökull — contains about as much water as 1.7 billion swimming pools.