Wading in the Natatio Pool Aisle                       -      N      - 
(-------------------------------------------------)     - <---(M)---> -
                                                        -      S      -

Large marble stones, precisely fitted and polished, form the curving,
semiparabola walls of the pool aisle.  The water you are waist deep in is
very clear, you can see that the bottom of the pool is decorated with a
large mosaic design.  The long pool extends north and south, rectangle in
shape and constant in its depth.