What is a watershed?

A watershed is an area of land that catches all the water that is on that land and flows into a creek or river. The boundaries between one watershed and another is the high point of land between one creek and another. What’s a watershed web link  http://www.watershedatlas.org/fs_indexwater.html  plus a list of more resource description pages http://www.watershedatlas.org/fs_resource.html