A thousand years ago, a tribe of people called the Vikings lived in the north of Europe, in what would become Sweden, Norway, and Denmark. Winters were cold and long, with months of snow. Some days, it was dark all day and all night. But, there was a great deal of coastline, as Sweden, Norway, and Denmark are all peninsulas, so there was an ample year around supply of fish, seafood, turtle eggs, and water fowl to eat.
Scandinavia has many natural waterways, including the famous fjords. A fjord is a long, narrow inlet of sea between high cliffs. Fjords were created by glaciers. You can find many fjords Norway and Iceland. There are also many rivers, lakes, and streams full of fish.
But farming was tough. The northern part of Scandinavia is full of mountains. Soil along the coastline is sandy. It was difficult to grow crops. In time, as the population grew, some Viking stayed because there was some good farmland. Around 750AD, some Vikings began to explore other places to raise their families, places like Russia, Britain, France, and Germany.