Portas V was the fifth planet of its system. It was located close to the Demilitarized Zone and was the site of a Breen settlement.

In 2373, the Maquis obtained large cold-storage units from the Breen on Portas V in order to maintain their stocks of a biogenic weapon, cobalt diselenide. Captain Benjamin Sisko discovered the Maquis presence after retrieving the sensor logs of two class-5 intelligence drones stationed in the area. (DS9: "For the Uniform")

This planet was only mentioned in dialogue.
According to Star Trek: Star Charts (p. 46) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Portas system was located in the Alpha Quadrant. This was a binary system with an F-class star and an M-class star.
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