Callao is a seaside city, port and region in the Lima metropolitan area of Peru.
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Callao or
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Callao may also refer to:
- Avenida Callao ('Callao Avenue'), Buenos Aires, Argentina
- Callao District, Callao Region, Peru
- Callao Cave, Peñablanca, Cagayan province, Philippines
- Callao Square, Madrid, Spain
- Callao, Missouri, United States
- Callao Township, Macon County, Missouri, United States
- Callao, Utah, United States
- Callao, Virginia, United States
- El Callao Municipality, Bolivar State, Venezuela