The Maruia River in New Zealand's Nelson/Marlborough region offers two distinct paddling experiences: a beginner-friendly multi-day run through beech forest, and the iconic Maruia Falls, which draws experienced kayakers from around the world.

The main recreational run is approximately 25 km, rated Grade 2 to 2+, with a put-in at approximately -42.136104, 172.221773 and a take-out at approximately -41.976594, 172.204250. The river begins as easy Class I/II through farmland before reaching the crux at Staghead (Stags Head) Stream, a Grade 3 rapid that can be scouted and portaged on either side. The majority of easy rapids are formed over gravel beds, while the harder boulder garden rapids result from slips and rockfall. The run is manageable in a single day but lends itself well to an overnight trip, with river terraces in the beech forest providing camping options. The recommended flow range is any level that is not flooding.

Maruia Falls, located approximately 10.6 km south of Highway 6 on Highway 65, is a separate and far more serious undertaking. The falls are roughly 10 metres in height and are considered suitable only for experienced boaters. Access involves following Highway 6 west from Murchison for 11 km, then turning south on Highway 65. A trail from the parking area leads up to a point about 100 yards above the lip, and a larger trail descends to the base of the falls. The falls have attracted high-profile kayakers internationally and are a feature of the annual Buller Fest event based in Murchison. Flow conditions significantly affect the character of the drop, with higher water producing notably different landing dynamics.

Below the falls, the river flows quietly to its confluence with the Buller River, a distance of approximately 21 km from the falls, with only a slight average gradient. The upper Maruia, above the main recreational section, is generally too shallow and braided for most craft except in flood conditions. The scenery along the river corridor is rated as exceptional, and the overall recreational value is considered high.