I touch on this subject a lot -at least in conversation- so although this isn't the end all, be all neighborhood map, it is a good reminder that "East of the River" is made up of a heckuva lot more neighborhoods than just Anacostia.
(to say it another way, lumping everything in this part of the city together and calling it "Anacostia" is just plain incorrect)
Click to Enlarge
true, the lines aren't as clearly drawn in real life as this makes them out to be ...but still helpful.
map courtesy of Wikipedia