Info on a lake that is not in WI....

[jmohns]

Hello all......
I was looking around on google earth today and I noticed a lake due west of Pearl Lake in South Beloit IL. It looks to be much larger than pearl and much clearer as seen from the sat. image. It also looks to be much darker..... maybe deeper????? Does anyone know of this lake? is this a private thing or  who could a person contact to dive it? It looks to be the sister of Pearl, soo maybee this is looking into???? Any help would be appreciated. James