Barely 15 000 years old, the St. Lawrence River is the world's youngest seaway! When out in the middle of the river, you feel you are at sea, and when close to shore, the physical traces of this waterway's birth and evolution can be read on its rocky shoreline. The St. Lawrence originates in the Great Lakes, but the waters from several other rivers that flow into the seaway contribute to its powerful current. Learn about the fascinating natural phenomena that create the magic of the St. Lawrence River.


The St. Lawrence River originates from the Great Lakes. As it flows towards the Atlantic, it increases in size due to the runoff from many streams and rivers in Quebec. The river flows through a variety of landscapes: flatlands and marshes, beaches and sand dunes, rocky shorelines and reefs, each with its own species of plants and animals. Humans have founded cities and villages along the St. Lawrence for millennia. Unfortunately, humans and beautiful natural environments do not always make the best neighbours…

Streams and rivers
Shoals and reefs
Beaches and sand dunes
Flatlands and marshes
Cities and villages


Cities and villages

Bird's eye view of the St. Lawrence River
Cities and villages, St. Lawrence River
If you have ever flown over the St. Lawrence Valley, you undoubtedly noticed the houses and villages stretched along the length of the river like a long, winding road. And this is exactly what the French colonists intended when they first settled in Quebec. At the time, the only way to travel quickly inland was to take a boat up the St. Lawrence River. It made sense that each colonist had easy access to this "moving roadway"; no sense dragging a canoe or rowboat through the woods when you can tie it at the end of a dock. Later on, those living along the river built a special type of water craft for travelling along the St. Lawrence: a flat-bottomed schooner called a goélette.

Each colonist had a lot that started at the edge of the river and went deep into the woods. In this way, everyone could use the river for transportation or to go fishing and use the forest to hunt game, gather firewood or get logs to build a home. Villages were often founded at the mouth of river, where a flour mill could be built. In the 1800s, rivers were used to float logs from the hinterland to the St. Lawrence.

The particular layout of the colony also allowed for speedy communication. As modern forms of technology such as the telephone or radio did not exist, news could be easily spread from house to house and village to village, all the way to Quebec City, where the governor lived and the troops were stationed. As soon as an enemy vessel was spotted, a messenger could be sent to warn the colony, and people along the entire length of the St. Lawrence could prepare to defend themselves.

Humans have lived in Quebec for 12 000 years!
Well before the arrival of French colonists 400 years ago, Quebec was inhabited by many Aboriginal peoples. Apart from the Iroquois, all other Aboriginal nations were nomadic, moving from one encampment to another depending on the season and traditional food-gathering activities (hunting and fishing). For example, in the summer, they would set up a temporary camp beside a bay on the St. Lawrence, where they could hunt whales, catch salmon and gather fruit.

Archeologists have discovered many Aboriginal campsites in Quebec. As you may be aware, archeologists are scientists who dig in the ground to find ancient objects and traces of human settlement. Depending on the material, shape and age of an object, as well as the use to which it was put, archeologists are able to piece together the mystery of what happened to its former owner.

Artefacts beneath Quebec's cities and villages?
Archeological digs done over the past 100 years in Quebec have taught us a lot about the lifestyle of the continent's first inhabitants, the Aboriginal peoples. Evidence suggest humans have been living in the same areas for millennia, often establishing communities along the St. Lawrence or at the mouth of a river. If you live along the St. Lawrence, you may be walking on some ancient artefacts! But do not start to dig in your yard without your parents' permission!

Archeologists say you have to know how to "read" the landscape to locate a site where there is a good chance of discovering a former human settlement. The landscape is like a large open book, and the words are found in the bodies of water, forests and mountains, all different habitats for a range of plant and animal species. If you want to find traces of human occupation, wouldn't it make sense to look where people would want to live?

Dive into the Blue Museum to learn how to "read" the land and identify the many clues telling you about the environment of the St. Lawrence, as well as about the fauna, flora and people living in an area stretching from Montreal to Gaspé! You will also discover that marine archeologists are studying the St. Lawrence riverbed.

To learn more about archeological digs in Quebec:
Archéo-Québec