Drainage basins

• The drainage basin is the area of land around a river that is drained by the river and its tributaries.

  
• Watershed


  The area of high land forming the edge of a river basin

  
• Source


  Where a river begins

  
• Mouth


  Where a river joins the sea

  
• Confluence


  The point at which two rivers meet

  
• Tributary


  A small river or stream that joins a larger river

  
• Channel


  This is where the river flows