Zelenogorsk (Russian: Зеленого́рск; before 1948 Terijoki, a name still used in Finnish and Swedish), is a municipal town in the Kurortny District of the federal city of Saint Petersburg, Russia. The town is a suburb of Saint Petersburg. It's located in part of the Karelian Isthmus on the shore of the Gulf of Finland, and has a station on the St. Petersburg-Vyborg railroad. It is located about 50 kilometers (31 mi) northwest of central Saint Petersburg.