The Edge of A Large Pit                                -      N      - 
(-------------------------------------------------)     W <---(M)---> -
                                                        SW     -      -

You are walking through a huge chamber somewhere beneath the surface of
the world.  There is a large pit to the southeast, and at the bottom you can
see a tunnel leading even deeper into the ground.  The edges of the pit are
very steep, and there doesn't seem to be any way to climb down safely at
this point.  Perhaps you will be able to find a better path somewhere
nearby.