This Design Observer blog post points out some of the wonderful inadequacies of Google when it comes to rivers.
Mislabeled, or not labeled at all are the main criticisms, oh and a rather warped sense of priority. (Ditch #1 , Osceola, AR – all present and correct. La Seine, Paris, France – missing).
Check out the article here.
Related Info –
http://www.41latitude.com/ A blog devoted to Google & Bing Maps.