Auckland (Maori: Tāmaki-makau-rau) is the largest city in New Zealand, located on the North Island. It is a city of 1.3 million people. It is colloquially known as the "City of Sails" due to the high number of yachts and its favorable conditions for sailing. It hosted the America's Cup in 2000 and 2004. Auckland has the largest population of Polynesian people in the world. It is located on an isthmus between two harbors, the Manukau and Waitemata. Due to it's significant urban sprawl, Auckland encompasses has four administrative regions; Auckland city, Waitakere city, Manukau city and North Shore city. Auckland is situated in an area with many extinct volcanoes. This resulted in heavy indigenous inhabitation, as the volcanoes produced fertile land and easily defensible terrain.