What is the longest track in NASCAR?

Nascar's longest track is Road America, located in Elkhart Lake, Wisconsin. It is a 4.048 mile road course. The Nascar Nationwide Series competes at this track.

For the Nascar Cup Series, the longest is Talladega Superspeedway, located in Talladega, Alabama. It's 2.66 miles in length and is Nascar's largest oval track.