Pasvik Nature Reserve (Norwegian: Pasvik naturreservat; Russian: Пасвик, Pasvik zapovednik) is a bilateral nature reserve located in the valley of Pasvikdalen in Norway and Russia. The nature reserve was established in 1992 (Russia) and 1993 (Norway), and covers an area of 166.4 square kilometers (64.2 sq mi). The Norwegian part, in the municipality of Sør-Varanger, covers 19.1 square kilometers (7.4 sq mi), while the Russian part, in Pechengsky District, Murmansk Oblast, covers 147.3 square kilometers (56.9 sq mi). The nature reserve includes unexploited parts of Pasvikelva and has a rich birdlife.