Most of the world’s large mountainous cities are found in the southern hemisphere in developing countries in the low to middle income bracket; high mountain cities in developed countries do not have large populations. The Bolivian cities of El Alto and La Paz have the distinction of being the two highest cities in the world and are both part of a metropolitan region with a population approaching 2 million. Mexico City is by far the largest and is part of one of the largest metropolitan areas in the world; it includes the three cities of Ecatepec, Nezahualcoyotl and Naucalpan, all of which are over 2,000 metres above sea level (ASL). Other major medium to large high altitude cities include Kathmandu (Nepal), Ulaanbaatar (Mongolia) and Kunming (China) in Asia; Harare (Zimbabwe), Addis Ababa (Ethiopia) in Africa; and Bogotá (Colombia), with more than 7 million inhabitants, in South America. Altitudes range from 1,350 metres ASL in Ulaanbaatar to more than 4,000 metres ASL in the cas.
From collection: Waste Management Outlook for Mountain Regions - Sources and Solutions