Real World article
(written from a Production point of view)

The Bolian system, according to the script of the Star Trek: Deep Space Nine episode "The Reckoning", was the system containing Bolarus. [1]

The system came up in a senior staff briefing on the war with the Dominion, as Romulan forces had forced the Dominion to retreat from the system. However, in the filmed version Bolarus was replaced by Benzar, and the Bolian system with the Benzite system.