The Masurian Canal (German: Masurischer Kanal, Polish: Kanał Mazurski, Russian: Канал Мазурский) is an unfinished 50.4 km long canal connecting the Lava River in Kaliningrad Oblast of Russia (a tributary of the Pregolya) and Lake Mamry, one of the Masurian Lakes in Poland. The present day Polish-Russian border cuts the canal, with the southern section about 20 km long located in Poland, and the rest in Russia.