Mystic Lake in Medford, Massachusetts consists of Upper and Lower Mystic Lakes, offering 293 acres of paddling opportunities within an urban setting. The Upper Mystic Lake spans 200 acres with a maximum depth of 85 feet, while the Lower Mystic Lake covers 93 acres.

The primary boat launch is located at 481 Mystic Valley Parkway in Medford, featuring a paved ramp near the Bacow Sailing Pavilion. Additional car-top access points exist between Shannon Beach and the Tufts Boat House, with four parking areas available. The Upper Mystic Lake prohibits motorized boats, while the Lower Mystic Lake allows power boats with a 6 mph no-wake restriction.

Paddlers can explore approximately 3.6 miles of shoreline on Upper Mystic Lake and 1.8 miles on Lower Mystic Lake. A notable paddling route extends north from the launch site up the Aberjona River, offering a 3-mile round trip that takes roughly 1 hour and 40 minutes to complete. The eastern and southern shores are protected as parkland, providing excellent shoreline access.

The lake features several points of interest, including Shannon Beach for swimming, the Winchester Boat Club marina, and the Tufts University sailing program. Wildlife observers can spot swans, herons, and ducks. The shoreline alternates between developed areas with waterfront homes and natural sections with informal picnic areas.

Water clarity is limited to about three feet due to the lake's fertility. While submerged vegetation is minimal, emergent vegetation is abundant in the northern basin. The lake system supports 13 fish species, including largemouth bass and chain pickerel.

Facilities include picnic areas, grilling stations (gas/propane only), and the Bacow Sailing Pavilion. The lake is part of the Mystic Lakes State Park, which operates from dawn to dusk year-round. Water quality monitoring is conducted regularly, with swimming advisories issued within 48 hours after storms.