The Upper Navua cuts a gorge so narrow that sunlight reaches the river only at midday, carving through volcanic basalt laid down eighteen million years ago when the Pacific Plate collided with the Indo-Australian. The canyon walls rise three hundred metres above the waterline, draped in cloud forest that has remained unlogged because no road crosses the upper basin. Geologists surveying the gorge in 1987 recorded thirty-two waterfalls within a twelve-kilometre stretch, most of them unnamed, fed by monsoonal rains that can drop four metres annually on the interior highlands of Viti Levu. Commercial rafting began in 1996 when Rivers Fiji secured access through a partnership with the four Fijian villages that hold customary land rights over the watershed: Nabukelevu, Namuamua, Nadrau, and Navai. The agreement allocates a portion of tour revenue to conservation projects, including a replanting programme for dakua trees and monitoring of the endemic Fiji ground frog, a species found only in the upper Navua basin. The rafting corridor itself is class III-IV whitewater, technical rather than violent, with rapids named by guides who worked the river in the early years—Jaws, Curtain, Washing Machine—each demanding precise paddle timing through hydraulics shaped by boulders the size of shipping containers. The upper navua river rafting fiji expeditions launch from the village of Nakavika, reached by four-wheel-drive track from Pacific Harbour, a journey that climbs from sea level to five hundred metres over twenty-eight kilometres of switchbacks. The put-in sits at the threshold of the Namosi Highlands, where the river is still shallow enough to wade but already committed to its descent toward the coast. Rafts carry six paddlers and a sweep guide, all wearing helmets because the canyon narrows to less than ten metres in several sections, forcing boats through chutes overhung by lianas and tree ferns that lean out from the walls. The take-out lies eleven kilometres downstream, where the gorge opens into a valley broad enough for taro terraces and a dirt airstrip used by charter flights during the wet season. No roads parallel the canyon, and mobile signals vanish within the first kilometre. The only structures visible from the river are bamboo platforms built by villagers for net fishing, anchored to cliffs with ironwood poles that must be replaced every monsoon. The upper navua river rafting fiji tours operate Monday, Wednesday, and Friday to limit foot traffic on the access trail, which crosses a hanging bridge rebuilt in 2019 after Cyclone Keni washed out the original span. The river runs year-round, but flows triple in volume between November and March, turning the class III rapids into class IV and closing two sections where the hydraulics become unrunnable. Guides carry throw ropes and first-aid kits rated for remote wilderness, and every departure includes a safety briefing conducted in English and Fijian, covering swim protocols for swimmers separated from the raft in fast water.