The caldera contains a narrow strip of land surrounding a black, salty lake. Trees grow inside, decorated with mysterious hanging stones over what appear to be graves. The heat inside the caldera is terrible, because the walls of the cone block off all breezes. Rocks are tied to the branches of trees inside Satonda's caldera. Satonda's beach is remarkable because a major portion of its sediment consists of pebbles of pumice.
Pumice is foamy volcanic glass, so light that it floats on water.
As the waves lap in and out, the pumice portion of the beach washes in and out as well. The pumice pebbles vary from black to white, and some are porphyritic, containing large crystals of black pyroxene. The jungle growing up around the outside of the cone is home to thousands of enormous fruit bats. They live high up in the trees, circling over the jungle, sleeping in the trees and lazing around during the day. Walking through the jungle beneath them, you can hear them chattering to each other, see them stirring amidst the branches, and smell them in their abundance.