The Corn Field is a region of mythological status where once naughty avatars were sent to think about what they had done. "The corn field" is a vast star-lit field of corn and was cut off from communication with the rest of the world (a reference to the classic Twilight Zone episode, "It's a Good Life").
It is located at the North-West tip of Orientation Island 1 and closed to the public. Perhaps one day the prison will be open for viewing?
Have you ever been sent to the Cornfield?