Saguenay-St. Lawrence Marine Park is one of French Canada’s best-kept secrets. Home to more than 2,200 species, this National Marine Conservation Area offers some of the best whale watching in the world. From May through October, these giant marine mammals congregate where the Saguenay River meets the St. Lawrence Estuary. This watershed serves as a gateway between the Great Lakes and the Atlantic Ocean. The largest estuary in the world, it’s an area perfectly suited for whales—one of high productivity, plentiful sunlight and rich feeding grounds.

Nat Hab travelers on our Whales & Nature Trails of Quebec trip explore four national parks and a marine reserve in French Canada, searching for animals amidst the spectacular fall foliage and at sea. Guests spend eight days hiking glacial valleys and gorges, photographing wildlife and enjoying guided whale excursions by Zodiac. Our environmentally responsible boat operator belongs to the Eco-Whale Alliance, which supports whale research, education and sustainable practices. From Marina de Bergeronnes, we set out on a thrilling whale-watching expedition in the hopes of seeing some of the species below.

1. Blue Whales

The largest animals on Earth, blue whales can grow up to 90 feet long and weigh 80 to 135 tons. These baleen whales eat 4 tons of krill each day to maintain their weight. Blue whales are endangered, with just 5,000 to 12,000 individuals remaining globally. Historical overharvesting has kept their population numbers low, and their reproduction rate is also slow. Blue whales produce a single calf every 2 to 3 years. Home to a yearly congregation, the St. Lawrence Estuary is one of the best places to see these gentle giants.

aerial of fin whale

2. Fin Whales

The second-largest whale in the world ranges between 50 to 70 feet long and 40 to 50 tons in weight. Listed as vulnerable by the IUCN, the North Atlantic population had approximately 40,000 individuals pre-whaling. Today, the population hovers around 4,000. Although hunting is now banned, both fin whales and blue whales are at risk of ship strikes. Following the pattern of other baleen whales, they spend summers at feeding grounds near the poles and winters in warmer waters near the Equator for mating and calving. They produce a calf every two to three years.

A humpback whale breaching

© James Goodheart

3. Humpback Whales

Humpbacks are known for their spectacular breaches, which Nat Hab travelers may be lucky enough to see on one of their whale-watching excursions. Humpbacks are 30 to 50 feet long in maturity and weigh 25 to 35 tons and are identifiable by their long pectoral fins. One of the hunting strategies of this baleen whale is bubble netting, where they circle around fish to create a wall of bubbles before lunging through to feed. They fast during their migration and calving time, so summer months are crucial for building fat reserves to support gestation and lactation. Humpbacks were endangered in the 1980s but are longer at risk thanks to a global moratorium on whale hunting in 1986.

Minke Whale Photography at Tadoussac, Quebec

4. Minke Whales

The world’s second-smallest baleen whale (after the pygmy right whale), minke whales range between 18 to 30 feet in length and weigh between 6 to 10 tons in maturity. Minke whales have distinctive sickle-shaped dorsal fins and a white band on each flipper. Like other baleen whales, they have two blowholes and grooves that allow their throats to expand while they filter feed, helping them push water through their baleen plates while retaining krill and zooplankton. Mating and calving occur while they are in the Tropics. They breed annually when they have adequate reserves, producing one calf each year.

5. Beluga Whales

Although most whales found in the marine park are migratory, endangered St. Lawrence belugas are year-round residents, with a population of 889 individuals. In the 1930s, they were the target of an extermination program as they were thought to be affecting salmon and cod fisheries. This was eventually disproven, as belugas’ diet consists mainly of non-commercial species such as capelin, sand lance and mollusks. Their catch was outlawed in 1979, but their population is still recovering.

These toothed whales reach up to 16 feet in length and weigh up to 3,500 pounds. Since 2016, a single narwhal has been spotted among belugas in the St. Lawrence. Scientists theorize that this young narwhal got lost and was adopted by a pod of male belugas in the estuary!

Harbor porpoise

A harbor porpoise © Erik Christensen, CC BY-SA 3.0, via Wikimedia Commons

6. Harbor Porpoises and Other Marine Mammals

On your maritime adventure, be on the lookout for harbor porpoises, which range 4 to 6 feet in length and weigh between 90 and 140 pounds. These small, toothed whales are a species of special concern in Canada, as they are sometimes caught as bycatch in bottom-set gillnets. Travelers have a chance to see several seal species, including harbor seals, harp seals, gray seals and hooded seals. The St. Lawrence Estuary is also home to North Atlantic right whales, Atlantic white-sided dolphins, white-beaked dolphins, long-finned pilot whales, orcas, northern bottlenose and sperm whales.

Can’t get enough of whales? There are 69 species of toothed whales and 14 species of baleen whales around the globe! In addition to Quebec, Natural Habitat Adventures offers expeditions to see gray whales at their calving grounds in Baja. We also encounter belugas in Churchill and humpbacks in British Columbia and Antarctica.