The Mason-Dixon Trail connects the Appalachian Trail with the Brandywine Trail. This 199 mile trail starts at Whiskey Springs on the Appalachian Trail in Cumberland County, PA and heads east towards the Susquehanna River, passing through Gifford Pinchot State Park en route. The trail then follows the west bank of the Susquehanna River to Havre de Grace, MD. Across the river, the M-DT continues east, passing through Elk Neck State Forest, then onto Iron Hill Park, DE, north along the Christina River and White Clay Creek to the White Clay Creek Preserve. The trail then heads northeast to it's eastern terminus at Chadds Ford, PA, on the banks of the Brandywine River.
Maps of the trail are available for sale on their web site.