Planet Aridia was a virtually inhospitable desert world on which all structures built there seemed to sank into mud. There was very little vegetation to speak of on this planet. The few inhabitants lived on Outposts scattered around the planet. Tar seemed to cover much of the planet. Factories were some of the main workable places there, because not much can survive in the odd desert filled with mud, Sandsharks, and other things. There were also Flamethrower Bots who, mistaking Ratchet for a Sandshark, attacked him with their flamethrowers.
In Ratchet & Clank the Infobot for planet Aridia was purchased from The Plumber for 500 bolts on planet Novalis in the Waterworks, and showed Skid McMarx and his agent getting attacked and crashing onto the planet. The attackers might very well had been Blarg security forces.
In Ratchet & Clank: Up Your Arsenal, Ratchet and Clank had to help the Galactic Rangers to defend the planet from Dr. Nefarious' forces, this time at Outpost X12. The fight was named Operation: Death Valley, which is the name of a desert park in California. The battle ended in a Galactic victory.