Bator Bai, an icy planet found within the Bator Bai system, existed in the Senex sector. This world was situated in the Senex-Juvex area of the Western Reaches, which itself was part of the Mid Rim. A hyperlane connected it to both the Kalgo and Suliana systems.
The planet Bator Bai was characterized by its prominent ice cliffs and strikingly clear caves. Similar to other planets within the Senex-Juvex region, Bator Bai was governed by the Ancient Houses, the noble families that held dominion there.
The reference book The Essential Atlas, released in 2009 and authored by Daniel Wallace along with Jason Fry, marked the initial appearance of Bator Bai, locating it within grid square L-18.