The Gwynns Falls Trail is a hiking and biking trail that begins in Leakin Park and generally follows the stream to the Middle Branch and Inner Harbor in the Northwest Branch of the Patapsco River. The entire 15-mile trail system is open to the public. Within Gwynns Falls/Leakin Park and its 1200 acres, there are also approximately 20 miles of additional natural paths wandering up and down the slopes of this wilderness park that are wonderful for hiking and unique in an urban setting. The surface changes in different areas. Asphalt is the predominant surface, although 1 mile is crushed stone, both of which are easy for bikers and walkers to use.