You're sitting in a watershed now
Homes, farms, ranches, forests, small towns, big cities and more can make up watersheds. Some cross county, state, and even international borders. Watersheds come in all shapes and sizes. Some are millions of square miles, others are just a few acres. Just as creeks drain into rivers, watersheds are nearly always part of a larger watershed. 

Videos
What is a Watershed
Everyone Impacts a Watershed
Potential Sources of Pollution