As it retreated, the glacier also formed a unique morainic ridge on the Lithuanian coast, known as the Dutchman's Cap. This hill (a parabolic dune rising 24.4 m above the sea) is constantly eroded by the pounding waves and drops to the shore in a slope 16–18 m high. The hill is thought to have got the name “Dutchman's Cap” because, seen from the sea, it looks like a Dutch hat. The Dutchman's Cap has long been a landmark for sailors and fishermen, as, overgrown with pines and oaks, it stood out well on the sandy plain. The cliff offers a view of the sea with steep shores and stony beaches. It is also a good spot for watching birds flying over the sea. At the end of the 19th century, when the Giruliai coast was being planted with greenery, a park for walks was created in these scenic places, with oaks, beeches, sycamores and other ornamental trees. The Dutchman's Cap cliff is included in the list of natural heritage sites.