Ingav is an inhabited planet and the homeworld of the Ingavi race. In the early 2300s, the Cardassian Union annexed the planet during their expansion. Two thousand Ingavi escaped and made their way to the Badlands, where their ship crashed on Sindorin.
After the Dominion War, Ingav became one of the United Federation of Planets' protectorates in Cardassian territory. The Ingavi on Sindorin were brought home to Ingav by a Federation holoship in 2376. (DS9 - Section 31 novel: Abyss)