Yadalla Prime

From Memory Alpha, the free Star Trek reference.

Yadalla Prime is a planet near the Romulan Neutral Zone in Sector 2158.

Yadalla Prime is the location of a Romulan archaeological site suggested as a possible raiding target for a group of mercenaries working for Arctus Baran in 2370. (TNG: "Gambit, Part I").

Yadalla Prime was called Yonada Prime in early drafts of the episode, a reference to the worldship in TOS: "For the World is Hollow and I Have Touched the Sky" (and presumably its destination). The name was changed due to the need for Romulan origins for the planet. (Star Trek: The Next Generation Companion)