Waterfall Cavern is a room in the Tallon Overworld in Metroid Prime. It is a small cave, open to the sky and inhabited by a number of Blastcaps on many mossy rocks. It consists mainly of a shallow pond and a few small waterfalls in one corner. A large piece of rock divides the room partway, so that Samus can only pass through via Morph Ball; on the other side is a smaller, closed cavern with the door to the Frigate Crash Site.
- "Volatile chemicals within this weed's toxic fungal cap may explode if agitated. The poisonous flesh of the Blastcap helps keep it from being eaten. It also detonates its fungal cap when it senses even slight contact."
- Missile Door Lock
- "There is a Blast Shield on the door blocking access. Analysis indicates that the Blast Shield is invulnerable to Beam weapons. Explosive weapons may damage it."
- Rock formation
- "This rock formation blocks most of the tunnel, but there is a small opening near the floor."