Cancun is a new and major resort city in southeastern Mexico on the Yucatan Peninsula. The population has grown rapidly to over 600,000. The city began as a tourism project in 1974 as an Integrally Planned Center, a pioneer of FONATUR (Fondo Nacional de Fomento al Turismo, National Fund for Tourism Development). Since then, it has undergone a comprehensive transformation from being a fisherman's island surrounded by virgin forest and undiscovered shores to being one of the two most well-known Mexican resorts. the downtown part of which is known as "El Centro," follows a master plan that consists of "supermanzanas"(superblocks), giant trapezoids with a central, open, non-residential area cut in by u-shaped residential streets. These open centers usually have walkways and 'sidewalks' around a central garden park.