Campo del Cielo refers to a group of iron meteorites and to the area in Argentina where they were found. The site straddles the provinces of Chaco and Santiago del Estero, 1,000 kilometers (620 mi) north-northwest of Buenos Aires, Argentina. It is half that distance, north-east, to Paraguay’s capital, Asunción. The crater field covers 3 by 18.5 kilometers (1.9 by 11.5 mi) and contains at least 26 craters, the largest being 115 by 91 meters (377 by 299 ft).
The craters’ age is estimated as four to five thousand years. Containing iron masses, they were reported in 1576, but were already well known to local aboriginal inhabitants. The craters and their surroundings contain many fragments of an iron meteorite. The total weight of the pieces recovered is about 100 tonnes, making the meteorite possibly the greatest recovery.
The largest two fragments, the 30.8-ton Gancedo and 28.8-ton El Chaco, are among the heaviest single-piece meteorite masses recovered on Earth, along with the 60-ton Hoba and a 31-ton fragment of the Cape York meteorite.