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It is on the top center of the forested part.
It's near the north-eastern side of the forest
There isn't a riddle box on every single Isle, but most have one... so there may not be one on Brown,but there might be...
Rocky Mountain Horse -answer for Horse Isle 2 riddle box on Brown Isle
I think I saw it in the Big Forest.
there is no riddle box
There none.
In the northwest corner of the isle :)
It is by the southern south west edge of the light green grassy area in the center. -CalicoFilly
in a bolder
Close to the western corner
It is South and slightly East of the dock house on Prairie Isle.