Magma Spring
From Pikmin Fanon
The second area in Pikmin: The Mystery Potion, and is covered in boils hot magma! with four caves scattered in it. You find Scarlet Pikmin here, and they are immune to the magma pools. There are no bottles above ground.
Enemies
Fiery Bulblax - Near the landing zone, guarding the Scarlet Onion.
5 x Bumbling Snitchbugs - Found near the Bulblax.
10x Dwarf Orange Bulborbs - Behind the Bulblax.
Spoliotoniumite
One is on top of a large, burnt stump. It requires yellow pikmin to collect it.
Another is inside the Combustive Snagret, which is near the entrance to the Lava Lake.