Swamps>are formed in soft, low lying ground near to a source of ample water. That source may be the ocean, a lake, a river, or even anaquifer. They tend to be small and compact. Swamps are of each extremein the time that they exist: a swamp with a good water source and little disturbance can exist longer than a mountain range.

Potholes>Upper course
Floodplains>Middle course
Levees>Lower course
River Terraces>Lower course
Swamps>Lower course
(I forgot to mention in my previos post)

Source:http://www.fantasymaps.com/101/swamp.html

~Nicole Mui~