Within a Dense Wood                                    -      N      - 
(-------------------------------------------------)     - <---(M)---> E
                                                        -      -      -

The large trees of the forest rise high overhead, blocking out virtually
all light from above.  The light fog drifting across the ground makes it
difficult to get your bearings, and you aren't quite sure which direction
but the underbrush is too thick to penetrate in that direction.