I thought the exact opposite. I'm in Chicago and the spill covers a 1/3 to 1/2 of Lake Michigan. After zooming out though, it clearly would cover Lake Erie or Lake Ontario. The thing that was put in perspective for me was the shear size of the Atlantic.
Interestingly enough the geolocation based off my IP actually puts me and virtually everywhere important around me (at least important to me) in the clear spots in the middle.