Greenhorn Ruins

From the Super Mario Wiki

The Greenhorn Ruins are ancient ruins that Wario had to go through in Wario World. This is the second level of the first world, Excitement Central, in the game. It had an amazingly large amount of puzzles, but to compensate, quite a bit of treasure and bonuses, as well. The boss of this level is Sandworm.

The enemies here include Magons, Clubosaurs, Cractyls, and Ankirons.

The only Area-Specific enemy is Old Red-Mug.

All of Wario's Treasures in this area are ceramics.

Areas in Wario World
Excitement Central
Greenhorn Forest | Greenhorn Ruins
Spooktastic World
Horror Manor | Wonky Circus
Thrillsville
Shivering Mountains | Beanstalk Way
Sparkle Land
Mirror Mansion | Pecan Sands