A Mirkwood Novella

"Actually as I have told you, they were not far off the edge of the forest;
and if Bilbo had had the sense to see it, the tree that he had climbed,
though tall in itself, was standing near the bottom of a wide valley,
so that from its top the trees seemed to swell up all around
like the edges of a great bowl, and he could not expect to
see how far the forest lasted."
The Hobbit J.R.R. Tolkien