 The main wall on the sea-facing side of Dubrovnik stretches from Fort Bokar in the west to St. John Fortress in the south, and to the Revelin Fortress on the land-side. These walls are 1.5 to 5 meters (5 – 16 feet) thick, depending on their location and its strategic importance. The purpose of these walls were to help defend the city from sea-based attacks, particularly from the Republic of Venice, which was often considered a threat to Dubrovnik's safety.
