Unused Sidebars

Hi all-

I’m using the Suffusion theme and as a result, I have entirely too many unused sidebar/widget areas. I just counted them and I have 37 of them lining my right hand margin. I only need a few of them, and the ones I need are located–wait for it–at the bottom of my trove of widget areas.

How can I remove the ones that I know I’ll never used? From what I gather, I have to go into my theme files and do something, but I’m not exactly sure.

Can I get some help please?
As always, any help or insight is appreciated.

-r
(Mods, if I put this in the wrong place, please move it to the correct board.)