The place where a river begins.

The point where the river empties into a larger body of water.

A wetland area that forms at the mouth of a river when sediment builds up as the river empties into a larger body of water.

The process of dropping off sediments, like soil, rocks, or silt, in a new location.

When a large amount of water overflows onto land that is usually dry.

The low-lying ground that a river flows over.

To carve or form a material into a different shape.

A body of water that originates from a glacier.

The movement of something from one place to another.