The Sarmizegetusa system was a star system part of the Iron Fang County, within the Lyran Star Empire. It was home to an asteroid field, which, in turn, contained Starbase 148. It was captured from the Kzinti Patriarchy in 2386. (RIS Bouteina: "The Measure of a Romulan")
In fact, the Sarmizegetusa system was close to both the Kzinti border and the Klingon Empire border. (Star Trek: The Stoneship Files: "Attack on the Laboratory")
It was also home to a colony on which Julie Pawluck practiced audiology after she went missing in action in 2375. (Star Trek: The Stoneship Files: "Express Delivery")