It is estimated that the population of Guatemala City proper is about 1 million, while its urban area is almost 3 million. The growth of the city's population has been robust, abetted by the mass migration of Guatemalans from the rural hinterlands to the largest and most vibrant regional economy in Guatemala. The inhabitants of Guatemala City are incredibly diverse given the size of the city, with those of Spanish and Mestizo descent being the most numerous. Guatemala City also has sizable indigenous populations, divided among the 23 distinct Mayan groups present in Guatemala. The numerous Mayan languages are now spoken in certain quarters of Guatemala City, making the city a linguistically rich area. Foreigners and foreign immigrants comprise the final distinct group of Guatemala City inhabitants, representing a very small minority among the city's citizens.