The agrarian city of Christchurch, also known as Otautahi is among the largest and most populous cities in New Zealand. The acts as the doorway to the Antarctic. The Christchurch international airport is an important base for the Antarctic exploration. Christchurch also holds the distinction of being one of only 8 pairs of antipodal cities in the world. This means that it is only one of 8 pairs of cities that have an inhabited land mass diametrically opposite to it. Its antipode is A Caoruna in Spain.