Volcanic Island

This is an area in Pikmin: The Huge Debt and Pikmin 4 (Wii U). It is actually near the side of a volcano that is almost never inactive. It has pools of lava that kill all pikmin (except Red Pikmin) instantly. When the volcano is inactive the pools of lava disappear. Also there is a 1/20 chance it will have an Ash storm here.

Caves
Lava Lake

Boiling Pot

Hot Maze

Gloopy Gulch

Brown hill

Dinoland

Secret Boss
In Pikmin 4, a secret boss can be encountered. However, it is located inside the volcano, which is hard to access. When inside, tossing a Red Pikmin at the tallest rock will cause the boss to awaken, the Lava Rhinoceratops

Pikmin
None (Pikmin: The Huge Debt)

Orange, Green (Pikmin 4 (Wii U))