This article is about a/an kaijin in Kamen Rider, the original series.

Amazonia (アマゾニア Amazonia, 22) - A piranha monster. He can launch his nails as projectiles and move through water. Led an underwater mining Shocker base. His personal emblem, worn on his soldiers' masks, is a fish wrapped around itself to make a circle. Captured and modified people who approached his base, but his activities were eventually discovered by the FBI and Kamen Rider #2. Destroyed by Kamen Rider #2's Rider Kick.