The McNaughton Park Trail Runs, over distances of 50, 100, 150 and 200 miles, is an annual ultramarathon running event held in Pekin, Illinois each spring on a rugged, ten-mile loop course. All four races are run concurrently; the 150 and 200-mile ultra are the only ones of that distance held in Illinois. The loop course is a single lane footpath, through natural countryside including forests and meadows; each ten-mile loop provides 1,600 feet of elevation gain. A thirty mile run, part of the event through 2006, was replaced by a 150-mile option beginning in 2007. Men 30 Mile: Paul Stofko 3:58:18 2005 50 Mile: Eric Grossman 6:52:34 2004 100 Mile: Karl Meltzer 17:40:13 2007 150 Mile: David Goggins 33:36:20 2008Women 30 Mile: Ellen Erhardt 4:35:34 2004 50 Mile: Jane Moser Cox 9:28:01 2005 100 Mile: Tracy Thomas 23:27:26 2006 150 Mile: Charlotte Vasarhelyi 46:21:29 2008 PotawatomiTrailRuns.com - Official web site
The metropolitan areas of Mexico have bean traditionally defined as the group of municipalities that interact with each other around a core city. In 2004, a joint effort between CONAPO, INEGI and the Ministry of Social Development agreed to define metropolitan areas to be any of the following: a group of two or more municipalities in which a city with a population of at least 50,000 is located in an urban area that extends over the limit of the municipality that contained the core city incorporating, physically or under its area of direct influence other adjacent predominantly urban municipalities, all of which either have a high degree of social and economic integration or are relevant for urban politics and administration a single municipality in which a city of a population of at least one thousand is located and contained a city with a population of at least 250,000 that forms a conurbation with other cities in the United States. Northwestern and southeastern states are divided into a small number of large municipalities, but central states are divided into a large number of smaller municipalities.
As such, metropolitan areas in the northwestern states do not extend over more than one municipality, figures report population for the entire municipality. However, metropolitan areas in the central states extend over many municipalities. A few metropolitan areas extend beyond the limits of one state: Greater Mexico City, Puebla-Tlaxcala, Comarca Lagunera, Tampico. There are 60 metropolitan areas, as defined by the following government bodies: The National Institute of Statistics and Geography; the Secretariat of Social Development. The National Population Council; the United States shares a 2,000 mi border with Mexico. It is the most crossed international border in the world, with about 250 million legal crossings every year; the distribution of the population in Mexico in urban areas, has been changed by the economic interaction between settlements in its north and the United States. The increasing population concentration in the north of Mexico is associated with the development of the maquila industries there and the eventual economic effects of North American Free Trade Agreement.
Metropolitan areas at the border with the US form transnational conurbations with deep economic and demographic interaction. For example, the San Diego – Tijuana metropolitan area consists of San Diego County in the US and the municipalities of Tijuana, Playas de Rosarito, Tecate in Mexico; the total population of the region has been estimated to be just over 5 million in 2009, making it by far the largest binational metropolitan area shared between the US and Mexico. The National Population Council recognizes the existence of such metropolitan areas and defines them as the municipalities with a city of at least 200,000 inhabitants and sharing processes of conurbation with cities of the US: A megalopolis is defined as a long chain of continuous metropolitan areas, or territories that are integrated amongst each other, a clear example being the Northeast Megalopolis in the United States. In 1996, the Programa General de Desarollo Urbano del Distrito Federal first proposed this concept to refer to the Mexico City megalopolis, or "megalopolis of central Mexico", expanded by PROAIRE, a metropolitan commission on the environment.
A megalopolis is known in Spanish as a corona regional de ciudades. The megalopolis of central Mexico was defined to be integrated by the metropolitan areas of Mexico City, Cuernavaca and Pachuca, which may conform complex subregional rings themselves; the megalopolis has 173 municipalities as well as the 16 boroughs of the Federal District, with a total population of 27 million people. Demographics of Mexico List of cities in Mexico List of metropolitan areas by population List of metropolitan areas in the Americas by population National Population Council — official website. National Institute of Statistics and Geography — official website