Page "Atlantis" Paragraph 11

Poseidon carved the mountain where his love dwelt into a palace and enclosed it with three circular moats of increasing width, varying from one to three stadia and separated by rings of land proportional in size.

The Atlanteans then built bridges northward from the mountain, making a route to the rest of the island.

They dug a great canal to the sea, and alongside the bridges carved tunnels into the rings of rock so that ships could pass into the city around the mountain ; they carved docks from the rock walls of the moats.

Every passage to the city was guarded by gates and towers, and a wall surrounded each of the city's rings.

The walls were constructed of red, white and black rock quarried from the moats, and were covered with brass, tin and the precious metal orichalcum, respectively.