Geo (ジオ, Jio?) is a rare fiend type in Final Fantasy X and Final Fantasy X-2, both containing a single fiend in each. They take the appearance of a large aquatic fish with an exposed ribcage where they can capture prey they suck up, allowing them to absorb any statuses that the prey may have before spitting them out. They specialize in heavy status attacks such as KO Punch, which inflicts Instant Death, and Stone Punch, which inflicts Petrify.
In Final Fantasy X-2 they take 4 kills to Oversoul.
Geo- comes from Ancient Greek γῆ (gê, "earth"; combining form γεω- (geō-)).