The Battle of Gangut (Russian: Гангутское сражение, Finnish: Riilahden taistelu, Finland Swedish:Slaget vid Rilax, Swedish: Sjöslaget vid Hangöudd) took place on 27 July^Jul./ 7 August 1714^Greg. during the Great Northern War (1700–21), in the waters of Riilahti Bay, north of the Hanko Peninsula, near the site of the modern-day city of Hanko, Finland, between the Swedish Navy and Imperial Russian Navy.