Campo de Marte originally was part of Exposición and later a horse racetrack, the Hipódromo de Santa Beatriz (before Jesús María Ward was split from downtown Lima Ward), in operation from 1903 to 1938.
Located principally in the city centre or Cercado de Lima and Rímac areas, the Historic Centre of Lima is among the most important tourist destinations in Peru.
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On the east, the district ends at the Santiago Tábara Naval Hospital or the western perimeter of the National University of San Marcos, where the Lima Province (or more specifically, the Lima District) begins
On the east, the Callao district is bordered by the Carmen de la Legua-Reynoso as well as the Lima Province's districts of San Martín de Porres and downtown Lima.
It lies directly to the north of downtown Lima, to which it is connected by six bridges over the Rímac River.
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.
Downtown Rímac District has, like its southern counterpart, its eastern and western sides divided by Jirón Trujillo, which connects to Lima District's Jirón de la Unión through the Puente de Piedra, the oldest bridge in the whole city.