There none.
there is no riddle box
In the northwest corner of the isle :)
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...
It's near the north-eastern side of the forest
It is by the southern south west edge of the light green grassy area in the center. -CalicoFilly
Close to the western corner
in a bolder
It is on the top center of the forested part.
It is South and slightly East of the dock house on Prairie Isle.
It is near the beach in east corner of the isle.
the top
keep riding south east of the village