The River Leven is located in northwestern Tasmania, flowing through a largely undammed catchment before reaching the sea at Ulverstone. It is one of the few rivers in Tasmania that has not been modified for irrigation or hydro development, which gives it a relatively natural character along its length. The river passes through several distinct areas including Loongana, Gunns Plains, the Dial Range, and the estuarine section near Ulverstone.

The primary paddling access point near Ulverstone is a boat ramp located close to the Ulverstone Rowing Club, which also provides launch points. Free car parking is available at this location, and it sits near the main shops in town. Boat ramps are situated on both sides of the estuary at Ulverstone.

The lower section near Ulverstone is tidal and estuarine, requiring awareness of tidal conditions and the respect appropriate for salt water inlets. Large areas of this section are fairly shallow, which demands caution for pedal-powered watercraft. Responsible boating practice in the estuary includes accelerating gently in shallow water to avoid propeller wash stirring up silt and mud, which can cloud the water and disturb aquatic vegetation and fish habitat. A practical guideline used in the area is: "if it's white it's all right — if it's brown slow down," referring to the color of wash behind a vessel. Fishing regulations also apply on the river, including a prohibition on fishing from a boat within 100 metres of an angler fishing from shore unless the boat is securely moored.

The upper reaches around Loongana and Gunns Plains are noted as highly rated trout fisheries, while the estuarine section near Ulverstone is recognized for sea-run trout. The river also supports giant freshwater lobster. The broader catchment includes access points at Dial Range and Gunns Plains in addition to Ulverstone. Hazards noted in the area include deep water, strong currents, steep banks, electric fences, and cattle, particularly in the upper and mid sections of the river.