San Martín de Porres (SMP) is a district in Lima, Peru, located in the area known as Cono Norte. It is bordered by the district of Callao on the west; Los Olivos on the northeast; and the Rímac and Independencia districts on the east. The Rímac River marks its natural border with downtown Lima and Callao province's district of Carmen de la Legua Reynoso on the south; while the Chillón River, on the north, marks San Martín de Porres' border with Ventanilla, also in Callao, and Puente Piedra.