When people picture a European lake, they usually imagine a small, scenic pool tucked into the Alps. The continent's real giants sit far from those postcard images, spread across the cold northeast in Russia, Finland and Sweden. Some formed naturally as ice sheets melted thousands of years ago at the end of the last Ice Age, carving deep basins into the land as they retreated. Others are entirely human-made, built as reservoirs so large that people living beside them simply call them seas. Together, these six lakes and reservoirs tell two very different stories, one shaped by ancient glaciers, the other by twentieth-century dam building on an enormous scale. It's a striking contrast when you consider the timescales involved: glaciers spent millennia patiently shaping some of these basins, while engineers reshaped entire river systems and displaced whole towns within a matter of years to build the rest.
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