An Earthy Room                                         NW     N     NE 
(-------------------------------------------------)     W <---(M)---> E
                                                        SW     S     SE

Although the igneous rock walls of this cavern make it quite obvious that
the chamber was formed by volcanic activity, the floor is covered with a
think layer of soil.  While you are busy wondering how so much dirt has
collected here, you notice that there are several large mounds coming up out
of the ground.