The Edge of the Forest                                 -      N      - 
(-------------------------------------------------)     - <---(M)---> E
                                                        SW     -      -

You are standing in a large forest.  Large trees of a type that you have
never seen before grow closely together.  Their low-hanging branches, along
with thick vines and a dense undergrowth, form almost impenetrable barriers.
There is some sort of magic at work here.  The very shape of the forest
seems to change around you, and you are having a hard time maintaining any
sense of direction.