Quaint.

The pool at Cagsawa ruins has these odd markings about the rim, 4ft, 5ft, 6ft. Since like every country in the world that at least wants to join in with other nations Philippines are metric, I figured they were a quaint local unit of length, as the 4ft was much shallower than the 6ft.
A rough guess using my short height as a guide makes me think a Philippine ft is about 27cm. Sorry for the cm but mm is too fine in this case.
BTW the water at whatever time of day was always a delightful temperature but the green rather than the more inviting blue tiles for appearance was a let down for Olivia.