Niue is one of the world's largest coral islands. The terrain consists of steep limestone cliffs along the coast with a central plateau rising to about above sea level. A coral reef surrounds the island, with the only major break in the reef being in the central western coast, close to the capital, Alofi. A number of limestone caves occur near the coast.
niue is one of the world's largest coral islands the terrain consists of steep limestone cliffs along the coast with a central plateau rising to about above sea level a coral reef surrounds the island with the only major break in the reef being in the central western coast close to the capital alofi a number of limestone caves occur near the coast