The Aragonese Castle stands on a trachytic rocky islet connected to the eastern side of the island of Ischia by a stone bridge 220 meters long.
The bedrock is geologically defined "dome of stagnation" and is equivalent to a bubble of magma, which has been consolidated during the eruptions of the most far-reaching. It reaches a height of 113 meters above sea level and has a surface area of about 56,000 square meters.
The access is through a trail or through a modern lift installed at the end of the 70s.
The trail is developed, for the first part, in a tunnel dug into the rock (by the will of Alfonso I of Aragon in the middle of the fifteenth century) and then goes outdoors until you reach the highest part where the Male is.