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The Illyria system was an inhabited planetary system located inside the Vaultera Nebula in the Alpha Quadrant. One of its planets was Illyria. (SNW: "Ad Astra per Aspera"; Star Trek: Section 31)

Stellar cartography

In 2324, the location of Illyria was labeled in a chart used during a Section 31 Alpha Squad briefing. (Star Trek: Section 31)

In 3195, this system's position was labeled on a Federation star chart which was displayed in Starfleet Academy's Stellar Cartography laboratory. (SA: "Beta Test")

In 3196, during the Omega-47 crisis, the location of Illyria was depicted on star charts and readouts used across several locations on the USS Athena to locate, monitor, and respond to the Omega-47 mines laid by the Venari Ral. This system was outside the affected region. (SA: "Rubincon")

This star system was only mentioned in writing.

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