Amonash was a planet, somewhere in the space of the galaxy's Alpha or Beta Quadrants.

Prior to 2268 Cervantes Quinn had tried to pass himself off as a member of the Orion race. In the process Quinn was discovered and nearly shot. He did not have fond memories of the incident. (VAN - Declassified novella: The Stars Look Down)

No other details about Amonash was provided in the story.