Beloostrov (Russian: Белоо́стров; Finnish: Valkeasaari, both meaning lit. White Island), from 1922 to World War II—Krasnoostrov (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. Population: 2,080 (2010 Census); 1,690 (2002 Census); 1,405 (1989 Census).