le fleuve

The French word "fleuve" refers to a large river that flows into the sea or an ocean. It is a natural watercourse usually much larger and longer than a "rivière."

Meaning:

• Fleuve: A river that empties directly into a sea or ocean.

Differences with synonyms:

• Fleuve: A major river flowing into the sea. For example, the Seine or the Rhône in France are considered fleuves.
• Rivière: A river or stream that flows into another river (not directly into the sea). For example, the Marne is a rivière because it flows into the Seine.
• Cours d'eau: A general term meaning "watercourse," which includes all rivers, brooks, and streams regardless of size.

Summary:

• Use fleuve for big rivers that reach the sea.
• Use rivière for rivers that are tributaries to other rivers.
• Both carry fresh water, but the distinction is mainly about where they end.