Monsoon Jungle

From the Super Mario Wiki

Monsoon Jungle is a level of Wario Land 4 filled with alligators that jump up from water to attack Wario. The level itself is filled with areas where Wario has to cross alligator-filled waters by often moving platforms. Upon falling in the water, Wario must swim to safety while avoiding the alligators near the surface. Hidden areas are secretive in this level.