I have a test where I am given the following article, what is an answer for the question: At what location was eleven artificial mounds located? ?

Norte Chico sites are known for their density of large sites with immense architecture. Haas argues that the density of sites in such a small area is globally unique for a nascent civilization. During the third millennium BC, Norte Chico may have been the most densely populated area of the world (excepting, possibly, Northern China). The Supe, Pativilca, Fortaleza, and Huaura River valleys each have several related sites.
Evidence from the ground-breaking work of 1973 at Aspero, at the mouth of the Supe Valley, suggested a site of approximately 13 hectares (32 acres). Surveying of the midden suggested extensive prehistoric construction activity. Small-scale terracing is noted, along with more sophisticated platform mound masonry. As many as eleven artificial mounds "could be" present. Moseley calls these "Corporate Labor Platforms", given that their size, layout, and construction materials and techniques would have required an organized workforce.The survey of the northern rivers found sites between 10 and 100 ha (25 and 247 acres); between one and seven large platform mounds—rectangular, terraced pyramids—were discovered, ranging in size from 3,000 m3 (110,000 cu ft) to over 100,000 m3 (3,500,000 cu ft). Shady notes that the central zone of Caral, with monumental architecture, covers an area of just over 65 hectares (160 acres). Six platform mounds, numerous smaller mounds, two sunken circular plazas, and a variety of residential architecture were also discovered at this site.The monumental architecture was constructed with quarried stone and river cobbles. Using reed "shicra-bags", some of which have been preserved, laborers would have hauled the material to sites by hand. Roger Atwood of Archaeology magazine describes the process:
Armies of workers would gather a long, durable grass known as shicra in the highlands above the city, tie the grass strands into loosely meshed bags, fill the bags with boulders, and then pack the trenches behind each successive retaining wall of the step pyramids with the...

Aspero