The Valley of Ternaax was once a beautiful forested valley on the planet Rannon.

Sometime after the Clone Wars and the execution of Order 66, Dark Jedi Danaan Kerr settled in the Valley of Ternaax. Sensing a disturbance in the dark side of the Force, Kerr began terrorizing many of Rannon's inhabitants and training several in the ways of the dark side. As a result of Kerr's actions, the once beautiful valley rotted and lost its former beauty.