The Lithuania–Russia border is an international border between the Republic of Lithuania (EU member) and Kaliningrad Oblast, an exclave of the Russian Federation (CIS member). It is an external border of the European Union. The 274.9 km (170.8 mi) long border passes (from west to south-east clockwise) through the Curonian Spit and Curonian Lagoon, and then follows along the Neman River, Šešupė, Širvinta, Liepona, and Lake Vištytis. The sea border is another 22.2 km (13.8 mi). There is a tripoint between Lithuania, Russia, and Poland with a stone monument at 54°21′48″N 22°47′31″E / 54.36333°N 22.79194°E.
Most of the border follows rivers or lakes. On land, border stations are equipped with engineering and technical facilities (wired fences and the exclusion zone). Most other land areas have no fence, but some places near roads or villages have fences (e.g. at 54°27′11″N 22°42′08″E / 54.45306°N 22.70222°E with Street View coverage). Russians need a Schengen visa to cross the border into Lithuania, and Lithuanians need a Russian visa to go to Russia.