Hao'ao Introduction
An unmissable natural geological classroom, the coastal erosion landscape of XiYin HouAo is remarkably rich, featuring sea caves, sea arches, and sea stacks, making it one of the best places to observe coastal erosion formations. Sea caves form as the protruding headlands in the sea are eroded by water along broken joints or softer parts of the rock layers over time. If the erosion continues, and the sea cave is eroded through, it forms a sea arch. If the top of the sea arch cannot support itself and collapses, or if the middle section of the headland erodes and breaks away, it results in a sea stack, which becomes isolated in the sea.
