The highest dune of the Curonian Lagoon and one of the highest dunes in Europe is located near the village of Morskoe. The dune is known as the Walnut, but most often named after Efa, the highest point of the dune at 64 meters. It was named in honor of the forester Franz Ef, who became the author of the project to strengthen and plant forests of the Curonian Spit.