Stameris was an inhabited planet on which a slave market was located.

The Ferengi who attempted to pirate Enterprise NX-01 in 2151 contemplated selling some of the starship's women at the slave market on Stameris. (ENT: "Acquisition")

This planet was only mentioned in dialogue.
According to Star Trek: Star Charts ("United Federation of Planets I") and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), "), there was a star system named Stameris, in which this planet might possibly have been located, in the Alpha Quadrant. This was a binary system with a pair of G-class stars. In the late 24th century, it was an independent system.