Rivière Éternité is a river and village in Quebec's Saguenay–Lac-Saint-Jean region that serves as the primary gateway to Fjord-du-Saguenay National Park. The paddling experience here centers on Baie Éternité, a narrow bay enclosed by some of the fjord's highest cliffs, reaching approximately 400 metres in height. From this bay, paddlers access the broader Saguenay Fjord, where freshwater from the region's rivers merges with saltwater from the St. Lawrence estuary.

The main launch point is Baie Éternité, located within the national park. From there, guided excursions typically skirt the towering headlands to reach the base of the Notre-Dame-du-Saguenay statue, a national monument positioned on Cap Trinité, before crossing the bay to the Voile de la Mariée, a small waterfall on the opposite shore. The entire bay can be paddled in a few hours, making it well-suited for day trips. The itinerary is subject to change based on weather conditions, which is a practical consideration given the fjord's exposure to variable winds.

The area is notable for peregrine falcon habitat along the cliff faces. The dramatic vertical rock walls and the scale of the fjord define the visual character of the paddle. Isothermal and waterproof clothing is recommended for trips in May, June, September, and October, indicating that water temperatures in those shoulder seasons are cold enough to warrant thermal protection.

Kayak rental is available on site within the national park. The park also offers a visitor centre, hiking trails, camping, chalets, and ready-to-camp accommodations. There is no drinking water available at the launch site; paddlers are advised to arrive with filled water bottles, though cardboard water bottles are sold at the SÉPAQ reception desk. The cancellation and booking policies for guided activities fall under Saguenay Fjord National Park regulations administered by SÉPAQ.

The village of Rivière-Éternité, with a population of around 405, is approximately 1 kilometre from the park dock and offers lodging in bed-and-breakfasts, inns, and campgrounds. Marine shuttle services also operate seasonally on the fjord, running from approximately late June through mid-October, providing an alternative means of accessing the area by water.