It is nicknamed "The Friendly City" or "The Windy City", and is the seat of the Nelson Mandela Bay Metropolitan Municipality, South Africa's second largest metropolitan district by area. It is the most-populous city of the Eastern Cape, the sixth most-populous city in South Africa and the cultural, economic and financial centre of the Eastern Cape. The city is among the top five cities in the world for pleasant weather, according to a 2014 scientific climate study of 600 global cities. The city is known for many blue-flag beaches along the city's urban coastline; its popularity as an international and local holiday destination; and its rich and diverse cultural heritage. It is a tourism gateway city for Eastern Cape's adventure, outdoor and African big five game, malaria-free safari tourism, all in close proximity.