San Pedro de Inacaliri River

San Pedro de Inacaliri River
San Pedro River and Paniri volcano
Country	Chile
Basin features
River mouth	Loa River
Basin size	9,850 km2 (3,800 sq mi)
Physical characteristics
Length	76 km (47 mi)
Discharge	Average rate: 0.2 m3/s (7.1 cu ft/s)

San Pedro de Inacaliri River, or called simply San Pedro River, is a river of Chile located in El Loa Province, Antofagasta Region. It begins at the confluence of the rivers Silala and Cajón, at an elevation over 4,000 m asl.

A part of its flow is diverted (between 50 and 60 l/s) and conducted across the desert to Chuquicamata for domestic water supply. About 8 km south, the waters of the river disappear in a floodplain area to reappear 15 km downstream at the so-called Ojos del San Pedro in the form of a partially overground stream, at the eastern border of a salt flat with a surface of 5 km².

Before discharging into Loa River, the river skirts the San Pedro volcano, where it has carved a 100-m-deep canyon through a rhyolite lava flow.