1031 is the area code of Manaus, the capital of Amazonas State, Brazil. It is located at the confluence of the Black River and the Solimãos River (a tributary of the Amazon River), with an area of ​​14,300 square kilometers and a population of 2.21 million. Because Manaus is located in the center of the Amazon rainforest, it mainly relies on shipping and air transportation. This isolation helps to protect the city's nature and culture. Compared with other cities in Brazil, Manaus retains many traditional Brazilian indigenous cultures. It is a world-famous tourist city and one of the four major tourist destinations in Brazil. Manaus is also famous for its free trade zone. The city's industries are mainly metallurgy, electronics and machinery, and it also has the world's largest floating dock. Manaus is also one of the host cities of the 2014 Brazil World Cup. Its comprehensive strength ranks 496th in the 2019 list of the world's top 500 cities.