Question: where are the leitisvatn cliffs?
Answer: Leitisvatn (or Sørvágsvatn) is the largest lake in the Faroe Islands. It was used during World War II by the British army as a runway to land seaplanes. An optical illusion along the cliffs, at times, makes this lake appear as though it is suspended above the ocean with a perspective that would make M.C. Escher smile.