Boundary Trail (blue) is a hiking, biking, and horse trail in Harford County and Baltimore County, Maryland. It is within Gunpowder Falls State Park (Sweet Air Area). It is 4.7 miles long and begins at 496 feet altitude. Traveling the entire trail is 8.5 miles with a total elevation gain of 1,489 feet. The Gunpowder Falls State Park (Sweet Air Area) information map is near the trailhead. There are also benches, a parking, and a shelter. The Green Glade Pond water and the Big Rock can be seen along the trail. There are also a grassland and farmlands along the trail.
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