The Rivière Koroc rises in the Torngat Mountains near the Quebec-Labrador border, running approximately 100 kilometres westward before emptying into Ungava Bay near the Inuit community of Kangiqsualujjuaq (George River). The river descends from an elevation of roughly 1.7 kilometres, flowing through a wide glacially carved valley bounded by rolling hills to the south and sharp, rugged peaks to the north and northeast. The water is notably clear, with visibility reported at 10 to 15 feet in calm conditions, and carries a distinctive turquoise colour through much of its course.

The river presents Class III and Class IV rapids, making it suitable for intermediate paddlers confident in Class III whitewater and with canoe tripping experience. Novice paddlers can participate in guided settings with appropriate support. The upper section near the headwaters can involve shallow, rock-strewn stretches requiring dragging and lining loaded canoes before reaching navigable water. Korluktok Falls is a significant hazard requiring a portage. Paddlers should be prepared for highly variable water levels and a range of river conditions throughout the descent.

Access to the put-in is by air — helicopter or Twin Otter from Kuujjuaq takes approximately 1.5 hours, or roughly 45 minutes from the Torngat Mountains base camp — landing at a gravel airstrip in the Koroc River valley. The takeout is at Kangiqsualujjuaq on Ungava Bay. The remoteness of the route demands full self-sufficiency; the nearest settlement is the end destination itself. Camping is on the river bank throughout the descent.

The river corridor passes through Parc national Kuururjuaq, and while hunting and trapping are prohibited within the park boundaries, Inuit have the right to practise subsistence activities throughout Nunavik, including within the park. The Koroc and Palmer River valleys are traditional Inuit travel routes connecting communities on the Labrador coast with those on Ungava Bay.

Wildlife and dramatic mountain scenery frame the entire descent. As paddlers approach the mouth, the river broadens and shallows, and the influence of Ungava Bay becomes apparent. Guided expeditions of approximately 8 days are offered by Nunavik Parks, with options to paddle by kayak, inflatable canoe, or raft.