Kelton IV

From Memory Alpha, the free Star Trek reference.

Kelton IV is a the fourth planet in the Kelton system, located near Federation space.

One of the Dax hosts helped deliver rain-inducing technology to Kelton IV to alleviate a drought. However, once the drought ended, the planet's inhabitants severed contact with the Federation. (DS9: "Dramatis Personae")

It was not made clear whether it was Jadzia or Curzon who visited the planet.