Parnidis dune

The Parnidis Dune is a drifting coastal sand dune on the Curonian Spit, southeast of Nida, Lithuania, near the Lithuania-Russia border of the spit. It is almost entirely bare and reaches a height of 52 metres above sea level.

Its height once reached a maximum of 60 metres, but decreased due to the dune's steady eastward movement and discharge of sand into the Curonian lagoon, prominently at the Parnidis Cape under the wind-induced saltation.

Source: Wikipedia