Christchurch is the largest city in the South Island of New Zealand with a 2006 population of over 350,000, making it the second largest city in the country after Auckland. It is on the edge of the Canterbury plains and is a major stepping off point for touring the South Island. Christchurch was established in 1850 by English settlers. Its English heritage shows in the older buildings, especially the Anglican Cathedral in the Square in the very center of the city. The River Avon flows through the central city and disrupts the regular rectangular layout of the city streets.