The Betazoid home world. It looks like Earth in appearance and the climate is similar. It's considered to be of significant importance and is currently governed by the United Federation of Planets, though from 2374 to the end of the Dominion War it was controlled by the Dominion. The fall of Betazed is part of what prompted Captain Sisko to trick the Romulans into joining the alliance. (In the Pale Moonlight)