North Tea lake has tons and tons of campsites. I know why you ask for info.
I've only stayed on the east arm twice, once solo, the other time, with Mike B.
On the map below, the two sites circled in green, are the ones I've stayed on.
Both can accommodate 3 tents no problem...neither has a sand beach...the northerly one, has a massive fire-pit and bench system.
The southerly one, is large and flat..with lots of smooth rock all around...the landing(s) are rough.
Be warned; North Tea Lake can be a difficult paddle as the wind can be relentless on this lake..paddling out from the east arm, can be a very tiring affair. If you get lucky...it can be a fantastic paddle with the sun rising behind you.
Markus
Etobicoke, Onterry-airy-airy-Ohhh!