A Lush Cavern                                          -      N     NE 
(-------------------------------------------------)     - <---(M)---> E
                                                        -      S      -

The caves in this section of the mountain are completely unlike anything
you've seen before.  Although the igneous rock walls make it quite obvious
that the chamber was formed by volcanic activity, the floor is covered with
a thin layer of soil and there are a variety of plants growing everywhere. 
There is a small hole in the wall to the south.