Soltok IV was the inhabited fourth planet in its star system. This system was located in the Demilitarized Zone. In 2370, Lieutenant Commander Calvin Hudson claimed that a Federation merchant ship fired upon by the Cardassians was transporting medical supplies to Soltok IV. Gul Evek claimed that the ship was carrying weapons and had refused to be boarded. (DS9: "The Maquis, Part I")
Background information Edit
This planet was only mentioned in dialogue.
According to Star Trek: Star Charts (p. 47, "United Federation of Planets I") and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Saltok (sic) system was located in the Alpha Quadrant. The system's primary was a K-class star. In 2378, Saltok IV was listed as a Federation member.
The Star Trek Encyclopedia (4th ed., vol. 2, p. 245), as well, spelled the name of this planet as "Saltok IV".