Port of Spain's official population is relatively small, and reflects the narrow city boundaries including the central business district and a number of economically depressed and a few upscale adjoining suburbs. In addition to the official population, the adjacent East–West Corridor conurbation has a population close to 600,000 people and the "big city" feel with its suburban car dominated commuting. The corridor is the built-up area of north Trinidad stretching from the capital, Port of Spain,  east to Arima. It includes the towns of Barataria, San Juan, St. Joseph, Curepe, St. Augustine, Tunapuna, Tacarigua, Arouca, and Five Rivers, once distinct communities and now districts within a continuous urban area. For the most part it runs along the Eastern Main Road, between the Churchill–Roosevelt Highway and the foothills of the Northern Range.