The Sithi Nine Cities were nine great cities founded by the Gardenborn when they fled Venyha Do'sae, the Lost Garden, millennia earlier. The cities were great master-works in addition to housing the Sithi, Norns, and their kin for eons. Each of the Nine Cities had a Master Witness, which allowed for communication to the other cities, even across great distances.
The cities were slowly abandoned due to environmental factors or invasion.
Asu'a - destroyed in the year 666 by the mortal army of the Rimmergard king Fingil; the remains of Asu'a were built over and became the castle known as the Hayholt.
Enki-e-Shao'saye - city lost in the southeastern portion of Aldheorte Forest.
Jhiná T'seneí - city given to the Tinukeda'ya; lost under the waves when the land sank.
Kementari - lost city on or near Warinsten Island.
Mezutu'a - city given to the Tinukeda'ya by Jenjiyana of the Nightingales.
Tumet'ai - city abandoned due to encroaching ice.