What is the furthest distance ran nonstop by a human being?

Dean Karnazes author of Ultra Marathon Man: Confessions of an All-Night Runner, and long distance runner has ran 226.2 miles with only several stops of little more than a few minutes. His book, Ultra Marathon Man, describes some of his accomplishments such as running 200 miles in a little over 46 hours. One of the first to run a marathon in Antarctica to the South Pole.

Forrest Gump.

He also has ran Many marathons running like this around the world