Tammar, at first called Lelrais, functioned as the original home planet for the Tammarian species. Due to the exceptionally sparse atmosphere of this planet, Tammarians developed a unique internal sac, the chaghizs torm, designed for oxygen storage. This adaptation enabled their brief survival in the airless vacuum of space. Furthermore, Tammar was characterized by a complete absence of surface water.
Around 25,130 BBY, Lelrais became part of Xim's Empire, a consequence of he extending his territorial control outward from the Kingdom of Cron.
The principal researcher within the New Republic's Asset Tracking Office, Ayddar Nylykerka, hailed originally from Tammar.