Chaltok IV
Chaltok IV was the inhabited fourth planet in the Chaltok system of the Beta Quadrant. This planet was located within the territory of 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. ()

Appendices

Background information 

This planet's quadrant of origin is inferred based on the position its star system as seen in the star chart appearing in the  episode .

According to Star Trek: Star Charts (p. 67) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the primary of Chaltok IV was a M-class star.

Apocrypha 
In Star Trek Online, Chaltok IV is home to a Yridian colony by 2409.

External link 
 

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Chaltok 04
Colonies