Piggy is killed at Castle Rock in Lord of the Flies.
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Jack and his tribe make their headquarters at the Castle Rock.
The boys are savages, so they don't control the flies. Also, the lord of the flies is far away from castle rock, so they don't have to deal with it.
A fort.
Jack leaves for Castle Rock first when he forms his own tribe and has to defend himself from Ralph's tribe.
The platform is described as being formed of pink granite, as are the mountain, castle rock and all the other rock features of the island.