The Humber River flows through the west end of Toronto, Ontario, emptying into Humber Bay and Lake Ontario. The paddleable lower section covers roughly 6 kilometres round trip, with approximately 2 kilometres of river running downstream from the King's Mill Park area to the lake and about 1 kilometre upstream to the Old Mill below Bloor Street. The river is calm and meandering throughout this stretch, widening and straightening as it approaches the lake, making it accessible to paddlers of all experience levels.

There are several put-in options in the area. King's Mill Park has a formal boat ramp accessed from Riverwood Parkway, with free parking available. Etienne Brulé Park, located at 10 Catherine Street on the east bank, offers an informal access point with no ramp — paddlers carry their boats down to the water. A third option is a parking lot off South Kingsway beside a gas station near the corner of South Kingsway, from which a short path leads down to an old marina site on the river. For those taking out at the lake, the Humber Bay Park Boat Ramp at 225 Humber Bay Park Road West provides a convenient endpoint if a two-vehicle shuttle is arranged. Notably, the King's Mill Park launch is a short walk from Old Mill TTC station on the Bloor-Danforth subway line, making this one of the few paddling routes in Ontario reachable by transit.

Paddling downstream, the route passes under a series of bridges including the Queensway, the Gardiner Expressway, rail crossings, and the Humber Bay Arch Bridge before reaching the river mouth. The surrounding landscape transitions between genuine wetland habitat and urban scenery, including residential neighbourhoods and infrastructure. Wildlife observed along the route includes minks, blue herons, beavers, deer, swans, geese, and ducks. Water levels vary considerably throughout the year, running high in spring and low in late summer, which can affect access and paddling conditions.

Toronto Adventures operates kayak, canoe, and stand-up paddleboard rentals on the river from May through October, with guided tours and lessons also available. Their base is a five-minute walk from Old Mill TTC station. Rental pricing starts at approximately CA$40 on weekdays and CA$49.95 on weekends for a two-hour session.