1Seven Rila LakesSeven glacial lakes stacked up a mountain staircase.3–7 hVance_95 · CC BY-SA 4.0 · Wikimedia Commons
Map2Burgas LakesFour wetlands round one city, and one of the best places in Europe to watch migration3–8 hNordNordWest · CC BY-SA 2.0 · Wikimedia Commons