Ditto what goblu79 said. I did a White Otter trip last summer when BWCA and Quetico were shut down for fires. My map shows two campsites in Smirch near the middle of the lake, both on islands (the southeast end of the large island and one on the small island to the west of it). I have several marked on Dibble, mostly in the north and northeast parts. There looks to be one on a mid-sized island about 2 KM north and 0.5 KM east of the southernmost part of Dibble. Coordinates about N49 10.996 W92 03.415. I did not stay at either one so cannot vouch for the quality. You do have the option to camp anywhere, though.