El Callao is the largest and most important port in Peru. The city is also called Provincia Constitucional (Constitutional Province), the only province of the Callao Region. Callao is located west of Lima, the country's capital, and is part of the Lima Metropolitan Area, a large metropolis that holds almost one-third of Peru's population. Callao borders Lima Province on the north, east and south, and the Pacific Ocean on the west.
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