Atanum

The Indian name for a river in Washington State. It means “water by the long
mountain.” Here, as elsewhere throughout the world, a name appears among a
native people, combining the “At” prefix to describe a mountain bounded by water.
In this instance, “Atanum” suggests the ancient Egyptian Atum (god of the Primal
Mound) and/or Nun (the sea-god who sank it), both intimately connected with
the Egyptian version of the Atlantis story.