Being the location of the Kendra Valley Massacre during the Occupation of Bajor, the Kendra Valley is located in the Kendra Province on planet Bajor and in 2369 had a population of over 1,200. (DS9: "The Collaborator")
In 2375, Captain Benjamin Sisko purchased a large plot of land in the valley as the site for a house. (DS9: "Penumbra")