Battle of Grengam
1720 CE.
Shown on the map at 60.000°, 20.300°.
The Battle of Grengam (Russian: Гренгамское морское сражение, Swedish: Slaget vid Ledsund or Slaget vid Föglöfjärden, Finnish: Flisön taistelu) of 1720 was the last major naval battle of the Great Northern War. It took place in Åland, in the Ledsund strait between the island communities of Föglö and Lemland. Russian forces captured four Swedish vessels, and the battle is generally regarded as a Russian victory; however, the extent of Russian losses and the strategic significance of the result have been disputed in later historiography. Russian forces conducted further operations against the Swedish coast in 1721 before the Treaty of Nystad ended the war.
Text from the Wikipedia article Battle of Grengam, licensed CC BY-SA 4.0.