Gunpowder Falls State Park is an 18,000-acre Maryland State Park comprising several non-contiguous recreational areas in northeastern Baltimore County and western Harford County. It is primarily made up of the stream valleys of the Big and Little Gunpowder Falls and the Gunpowder River. The park has over 120 miles of trails with natural features ranging from tidal marshes to rugged interior slopes. Park areas can be found off various exits from I-83, I-695, and I-95.