International Rivers

International Rivers is an interesting website.  I encourage you to check it out:
http://www.internationalrivers.org/

I really like this part of their definition of a watershed:

"A watershed is a web of life. The life it supports is interconnected, meaning every creature and plant depends on other creatures and plants in the watershed for sustenance. If the whole watershed is like our bodies, then rivers are like our veins – coursing with life and crucial to sustaining it (International Rivers)."

International Rivers. (2015). Rivers Basin Basics. Retrieved from: http://www.internationalrivers.org/river-basin-basics