Yadalla Prime
Yadalla Prime was the prime planet in the Yadalla system. This system, located near the Romulan Neutral Zone, was in Sector 2158, a region of space in the Beta Quadrant.

Yadalla Prime was the location of a Romulan archaeological site suggested as a possible raiding target for a band of mercenaries working for Arctus Baran in 2370. Starfleet Command anticipated that Baran might attack this planet so a Federation starship was sent there to intercept his ship. ()

Background information 

This planet's quadrant of origin is inferred based on the position of its star system as seen in the star chart appearing in the  episode .

According to the script for "Gambit, Part I", the pronunciation for Yadalla was "yuh-DOLL-uh". 

Yadalla Prime was called Yonada Prime in early drafts of "Gambit", a reference to the worldship Yonada from the  episode . The name was changed in later versions of the script due to the need for Romulan origins for the planet. () The original name was retained in an okudagram seen on the bridge of the . This graphic was put up for auction in 2018. 

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Yadalla Prime
Romulan Neutral Zone