When flying over Lake Sorvagsvatn, the largest lake of the Faroe Islands with its surface area of 3,4 square kilometers, the lake appears to be significantly higher than the sea (left picture).
This is actually an optical illusion, created by perspective and by the higher cliffs that surround it. The lake really is only 30 meters above sea level, although it looks way higher than that! (right picture)
Still it’s pretty amazing, isn’t it?