Fort King George State Historic Site is a fort located in the U.S. state of Georgia in McIntosh County, adjacent to Darien. The fort was built in 1721 along what is now known as the Darien River and served as the southernmost outpost of the British Empire in the Americas until 1727. The fort was constructed in what was then considered part of the colony of South Carolina, but was territory later settled as Georgia. It was part of a defensive line intended to encourage settlement along the colony's southern frontier, from the Savannah River to the Altamaha River. Great Britain, France, and Spain were competing to control the American Southeast, especially the Savannah-Altamaha River region.