I am guessing by what you posted, which I find around sleeper
branch, you are very close to Rockwood. (Southwest) There was some posting on it before. Kind of cool back there, not a lot left though. You can get to that off 206 South. Most of those bogs are o.k. to check out I have found if you don't act stupid while out there & ask if you run into someone. Kinda neat if you check out their design. One very large set is also accessible right off 206. ( There is a very cool old bog tractor parked out there )
I always see & talk to people fishing some of the reservoirs.
If you mean by large sandy patch that section on both sides of 206.......
It's Blueberry fields.
** actually I'm looking at the fields, if you mean the large patch East of the bogs,I've been back there & It's cool to knock around. I can't imagine any one would bother you.