Vyborg Bay (Russian: Выборгский залив; Finnish: Viipurinlahti; Swedish: Viborgska viken) is a deep inlet running northeastward near the eastern end of Gulf of Finland in the Baltic Sea.
The Monrepos Park is considered a jewel of the bay and a major draw for tourists.
In 1790, the bay was the scene of one of the largest naval battles in history, the Battle of Vyborg Bay, with a total of 498 Russian and Swedish ships.
In the Middle Ages, the river Vuoksi had an outlet there, which however dried up little by little due to post-glacial rebound and was left completely dry in 1857 when the Kiviniemi rapids in Losevo (Russian: Лосево, Finnish: Kiviniemi), Karelian isthmus were formed and the Burnaya River became the main outlet of Vuoksa.
Lodochnyy Island lies in the middle of the bay, between Vyborg and Vysotsk.