The Curonian Spit is a 98-kilometer-long narrow sand peninsula that divides the Baltic Sea from the Curonian Lagoon. It stretches from the Kaliningrad Oblast of Russia to Lithuania's Klaipeda city. The spit's width ranges from 400 meters to four kilometers, and it features high sand dunes, pine forests, and sandy beaches.

The Curonian Spit is a UNESCO World Heritage Site, known for its unique natural and cultural heritage. It is home to several rare plant and animal species, including the black grouse, white-tailed eagle, and grey seal. The spit's landscape is also notable for the large, drifting sand dunes, some of which rise up to 60 meters high.

The spit has a rich cultural history, dating back to the 13th century when it was settled by the Curonian people. Over the centuries, the spit has been influenced by the cultures of Lithuania, Germany, and Russia. Visitors can explore traditional fishing villages, historical landmarks such as the Hill of Witches, and the Kursiu Nerija National Park. The spit is a popular destination for hiking, cycling, and water sports, as well as beach-going in the summertime.