What is the name of the planet where the Jedi fight the first battle of the Clone Wars?

The story behind the answer

The first clash erupts on the Separatists’ desert hive world, home to vast droid foundries and the Petranaki Arena, where a Jedi rescue spirals into open war; Yoda’s gunships arriving with clone troopers marks the conflict’s official beginning. Don’t confuse it with Kamino (storm-lashed cloning world where Obi-Wan tracks Jango Fett), Christophsis (an early battle from The Clone Wars series, but after the war begins), or Coruscant (the capital’s later, climactic battle in Episode III).

This battle unveils the Republic’s secret clone army, sees Mace Windu kill Jango Fett, and ends with Count Dooku escaping with superweapon plans given by Poggle the Lesser—foreshadowing the Death Star. It’s the spark that turns galactic tensions into full-scale war.