Fort Frederica National Monument, British colonial fort on St. Simons Island, Georgia, US.

Fort Frederica National Monument preserves the archaeological remains of a fort and town built by James Oglethorpe between 1736 and 1748 on St. Simons Island. The small brick fort stood as a citadel inside earthworks with palisades, a ditch and a glacis along the Frederica River, and the town was laid out on the Oglethorpe Plan. Excavated foundations of houses and workshops mark the former streets.

James Oglethorpe founded Fort Frederica in 1736 as a defensive position against Spanish colonial expansion from Florida. The settlement became a key location during territorial conflicts in the region's early colonial era.

The place reveals how colonists lived and worked together through the remains of homes and workshops that visitors can still explore today. Everyday objects found here tell stories of the people who inhabited this settlement almost 300 years ago.

The site is open to the public with free admission. A visitor center displays exhibits on the colonial era and the Yamacraw Indians. Living history demonstrations in period costumes take place several times a month. Parts of the fortifications have been reconstructed to their archaeologically determined dimensions.

The 1742 fighting is remembered for the Battle of Bloody Marsh, where troops of the 42nd Regiment and Darien Highlanders under Lieutenant Patrick Sutherland attacked a Spanish scouting party; Spanish accounts counted only seven dead. Oglethorpe's manoeuvring then forced the Spanish to withdraw to Florida.