- The Baltic Sea, which borders Lithuania to the west. The Baltic Sea is a large inland sea that is connected to the Atlantic Ocean by the Danish Straits. It is bordered by Sweden, Finland, Estonia, Latvia, Lithuania, Poland, Germany, and Denmark.
- The Curonian Lagoon, which separates Lithuania from the Kaliningrad Oblast of Russia. The Curonian Lagoon is a large lagoon that is connected to the Baltic Sea by the Klaipėda Strait. It is a popular tourist destination due to its beautiful beaches and sand dunes.
- The Nemunas River, which is the longest river in Lithuania. The Nemunas River flows from Belarus through Lithuania and into the Curonian Lagoon. It is an important transportation route and is also a popular fishing spot.
- The Neris River, which is the second-longest river in Lithuania. The Neris River flows from Belarus through Lithuania and into the Nemunas River. It is also an important transportation route and is also a popular fishing spot.
