|Desert erosion creates beautiful tree-like forms|
Do trees look like watersheds, or do watersheds look like trees?
When water flows the resulting erosion on the landscape can form shapes similar to trees. The 'trunk' of the main river is fed by smaller and smaller 'branches'. The overall form gives the appearance of the canopy.
It is another example of the repeating patterns expressed in nature. If you watch closely you can spot such patterns everywhere.