The Montague River flows through Kings County in eastern Prince Edward Island, emptying into the broader Three Rivers estuary system where the Cardigan, Brudenell, and Montague rivers converge near Cardigan Bay. The river is wide and calm under typical conditions, making it accessible to paddlers of varying experience levels. It is part of the Canadian Heritage Rivers System, a distinction awarded in 2004.

The primary put-in is at the Montague Waterfront Marina on Station Street in the town of Montague, located on the north bank of the river. This marina offers a boat ramp and is well-equipped with public washrooms, a visitor information centre, and nearby shops and restaurants. Kayak rentals are available at the waterfront. The recommended take-out for the most common day trip is the pier at Saint Andrews Point Road in Lower Montague. This downstream route covers approximately 4.5 miles and takes roughly 1 hour and 20 minutes to complete. Paddlers are advised to begin at high tide or shortly after for the best conditions. Day trips can also be started from St. Andrews Point or Brudenell Point, offering alternative access to the lower river and estuary.

The river supports active aquaculture operations, and paddlers can expect to encounter mussel farm infrastructure and working boats tending to the farms along the route. Motorized boat traffic is also present. The north bank features waterfront houses, giving the lower stretch a settled, working-waterfront character rather than a wilderness feel.

The Roma at Three Rivers National Historic Site is located in the area and represents a point of cultural and historical interest for paddlers exploring the estuary. The broader Three Rivers area is also noted for seal watching, particularly around St. Andrews Point.

The Montague Waterfront Marina has 70 slips with minimum approach depths of 12 feet, and the marina operates seasonally from mid-May until mid-September, with a general manager reachable at 902-838-4778 during that period. The off-season contact number is 902-838-2528.