All land is part of the watershed for some creek, stream, river or lake.
A watershed is more More than just an area of land, a watershed also provides us with a very useful way to look at the area where we live. Rivers and lakes don't stop at a state border, and neither does a watershed. If you know in what watershed you live, you know your ecological address, so to speak. Because all water in a watershed eventually drains into the same creek, river, lake, or bay, everyone in the watershed is connected through the water we use for drinking, recreational activities and industries. Within the Chesapeake Bay there are many smaller watersheds, called sub-watersheds.