Chaltok IV was the inhabited fourth planet in its star system. This planet was located in the Romulan Star Empire.

In the 23rd century, Chaltok IV was the location of a Romulan research colony. The colony was nearly destroyed during the testing of a polaric energy device, which led to the signing of the Polaric Test Ban Treaty in 2268. (VOY: "Time and Again")

This planet was only mentioned in dialogue.
According to Star Trek: Star Charts (p. 67) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Chaltok system was located in the Beta Quadrant. The system's primary was a M-class star.
In Star Trek Online, Chaltok IV is home to a Yridian colony by 2409.

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