Indeed one well-known monument site, known as Eflatun Pinar, holds a sacred pool that "is fed by a spring beneath the pool itself, " write Yigit Erbil and Alice Mouton in an article that was published in the most recent edition of the Journal of Near Eastern Studies.
There is a similar but slightly more secluded pool at Fatnas Spring, the small island in the salty Birket Siwa (Lake Siwa) accessible across a narrow causeway.