How do watersheds work?

The landscape is made of many interconnecting basins, or watersheds.  Within each watershed, all water runs to the lowest point--a stream, river, or lake.  On its way, water travels over the surface and across farm fields, forest land, suburban lawns, and city streets, or it seeps into the soil and travels as ground water.  Large watersheds like the ones for the Mississippi River, Columbia River, and Chesapeake Bay are made up of many smaller watersheds across several states.

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