Beloostrov

'White Island'), from 1922 to World War II Krasnoostrov (Russian: Красноо́стров, lit.

'Red Island'), is a municipal settlement in Kurortny District of the federal city of St. Petersburg, Russia, located on the Sestra River, Karelian Isthmus.

Beloostrov historically consists of two parts: Novy Beloostrov (Russian: Но́вый Белоо́стров, New White Island; Finnish: Uusi Valkeasaari) along the railway and Stary Beloostrov (Russian: Ста́рый Белоо́стров, Old White Island; Finnish: Vanha Valkeasaari) several kilometers to the north, mostly belonging to Vsevolozhsky District of Leningrad Oblast under the name Sadovodstva Island (Russian: остров Садоводства).

Until the Winter War Beloostrov was the last railway station before the Russia–Finland border.

Beloostrov has been a key station of the Saint Petersburg-Vyborg railroad since 1870 (initially named Rayala (Finnish: Rajala)) at the junction of Saint Petersburg–Zelenogorsk and Saint Petersburg–Sestroretsk–Beloostrov sections, being the final destination of many suburban passenger electric trains from the Finland Railroad Station.