Fort Crown Point was a British fort built by the combined efforts of both British and provincial troops (from New York and the New England Colonies) in North America in 1759 at a narrows on Lake Champlain on what later became the border between New York and Vermont. Erected to secure the region against the French, the fort is in upstate New York near the town of Crown Point and was the largest earthen fortress built in the United States. The fort's ruins, a National Historic Landmark, are now administered as part of Crown Point State Historic Site.