Yes, but you fail to understand the difference between a peninsula and a psuedo-island (a piece of land entirely surrounded by any body of water, artificial or manmade).
The Colorado River starts in Colorado is does not flow over the continental divide.
You would think so, but there is one river that happens to flow and split over the continental divide called North Two Ocean Creek. It’s the tiniest technicality that makes this map technically true.
https://en.wikipedia.org/wiki/Two_Ocean_Pass