Our first entry comes from right here in the District of Columbia.
Look at the labeling for East Potomac Park, the green area to the left of the Washington Channel. Yes, you're reading that (in)correctly. "Patomic" is not the correct spelling of this broad waterway or the adjacent park.
It's especially ironic since the golf course located in the park has the correct spelling, "Potomac."
See it for yourself at Google Maps.