The Kii Peninsula (紀伊半島 Kii Hantō) is the largest peninsula on the island of Honshū in Japan. It is named after the ancient Kii Province. The area south of the “Central Tectonic Line” is called Nanki (南紀), and includes the most poleward living coral reefs in the world due to the presence of the warm Kuroshio Current, though these are threatened by global warming and human interference. Because of the Kuroshio’s strong influence, the climate of Nankii is the wettest in the Earth’s subtropics with rainfall in the southern mountains believed to reach 5 metres (200 in) per year and in the southeastern town of Owase it averages 3.85 metres (151.6 in), comparable to Ketchikan, Alaska or Tortel in southern Chile. When typhoons hit Japan the Kii Peninsula is typically the worst affected area and d