When Ralph, Simon and Jack first climb the mountain they see a dip in the ground filled with blue flowers. The view from the mountain top reveals that they definitely are on an island. The island is roughly boat shaped with the mountain at the blunt end. The island slopes down through jungle to its pointed end, where it terminates in a rocky outcrop connected to the main island by a narrow causeway. Ralph points out that he can't see any smoke or boats and they assume from this that the island has no other inhabitants. On their way back to the beach the boys discover that there are pigs on the island.
Later in the book Ralph, Roger and Jack climb the mountain looking for the beast, which Samneric claimed that they saw there. In the darkness they see the body of the dead parachutist and mistaken believe that it is the beast.
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Samnericfirst saw and reported the beast on the mountain to the boys.
Simon wants to tell the other boys that 'the beast' on top of the mountain is not an animal with teeth, claws and wngs but simply the dead body of an airman wearing a parachute
Simon's death is ironic because he is on his way to tell the rest of the boys that the beast on the mountain top is simply the dead body of a man when he himself is mistaken for the beast and is savagely beaten to death.
When searching for the beast the boys get distracted by the rock formation, "Castle Rock", that could be a fort for them
The imaginary beast that frightens all the boys stands for the primal instinct of savagery that exists within all human beings. The boys are afraid of the beast, but only Simon reaches the realization that they fear the beast because it exists within each of them. As the boys grow more savage, their belief in the beast grows stronger. By the end of the novel, the boys are leaving it sacrifices and treating it as a totemic god. The boys' behavior is what brings the beast into existence, so the more savagely the boys act, the more real the beast seems to become.