The West Perimeter of the Shrine                       -      N      - 
(-------------------------------------------------)     - <---(M)---> -
                                                        SW     -     SE

Bubbles of sulfur rise to the surface of the lava flowing down the
volcano's sides, slowly inflating and popping as their surface tension
reaches their maximum, spewing hot specks of molten rock everywhere.  Bits
of rapidly-cooling pumice steam as their temperature plunges, and they turn
into solid rock.  They look safe to step on, the only place that purchase
can be gained, especially if this volcano is to actually be traversed.