A watershed can be defined as the area of land that drains to a particular waterbody. Watersheds come in all shapes and sizes. They cross county, state, and national boundaries. No matter where you are, you're in a watershed!
Topography is the key element affecting this area of land. The boundary of a watershed is defined by the highest elevations surrounding the stream. A drop of water falling outside of the boundary will drain to another watershed.
There are a number of watersheds in Albany County that drain either to the Hudson River or Mohawk River.