Castalian Spring
The Castalian spring was the sacred source of Delphi, and its water played an important role in the cult and procedure of the temple and of the oracle. This is where Pythia, the priests and the temple staff washed, and where the water used to clean the temple came from. The theopropoi - those wishing to consult the oracle - were also obliged to wash here in order to purify themselves.