There are only two places where the coast can be reached by road, but Fiordland is such an exceptional landscape that it remains a prime destination for those who are keen to discover the New Zealand coastline. The hard igneous rocks of the Fiordland mountains have been gouged by glaciers into perfect U-shaped valleys with immense near-vertical walls. The highest sea cliff in the world, Mitre Peak plunges directly into the sea from its summit height of 1692 m (5551'), and several other places come close to that height. Huge waterfalls flow into the fiords from lateral hanging valleys. The wildlife is rich with seabirds, penguins, dolphins and seals that can easily be observed.