ORIGINAL: xj900uk
Well they didn't call the waters around Savo Island 'Ironbottom Sound' for nothing...
Iron Bottom Sound Wrecks
Scroll down to page 19. I believe this is second only to Truk lagoon in the number of military wrecks in one general location. The French fleet at Toulon surpasses both, but that was intentional scuttling by the crew, and some ships were later raised.
Edit: it appears the map has an error, in that it shows the Kinagusa as hvaing sunk just off Lunga point, when Combined Fleet lists it going down off Rendova Island.