The Harlak system was a planetary system in the Alpha Quadrant. (Star Trek: Section 31)

History

In the mirror universe, a Terran Empire rebellion base was located on the planet Harlak in the 2250s. (DIS: "The Wolf Inside")

In 2260, Harlak was within the area of effect of a quantum uncertainty field. (SNW: "Subspace Rhapsody")

Stellar cartography

In 2259, the location of this system was labeled on a stellar cartography chart that was seen on the USS Enterprise's ready room viewscreen. This system's symbol had a blue color, indicating that it was affiliated with the United Federation of Planets. (SNW: "Strange New Worlds", "Children of the Comet")

In 2260, Harlak was labeled on a star chart denoting the spread of a quantum uncertainty field across the region. It was marked as a Federation system. (SNW: "Subspace Rhapsody")

In 2261, the location of Harlak was depicted on a star chart used by the crew of the USS Enterprise to highlight the location of Vadia. It was labeled as a Federation system. (SNW: "Through the Lens of Time")

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