Steep Ravine                                           -      N      - 
(-------------------------------------------------)     W <---(M)---> -
                                                        -      -      -

As you emerge from the forest, you manage to catch yourself just in time
to avoid falling down a steep incline.  The ravine runs down the corner of
the island, ending in a sharp bed of rocks just above sea level.  Climbing
down here would be pointless, so the only alternative is to head back into
the woods.