Aspero is a well-studied Late Preceramic site of the ancient Norte Chico civilization, located at the mouth of the Supe river on the north-central Peruvian coast. The site covers and area of approximately 35 acres and is made up of two large platform mounds, Huaca de los Sacrificios and Huaca de los Idolos, along with 15 other smaller mounds. After excavations archaeologists have found that each mound was built in stages, having two or three tiers rising about 10m about the surface. They have found ceremonial buildings, plazas, terraces, and large middens. Caches were found in theses structures including clay figurines, wooden bowls, feathers, cotton, and string and cane objects. The diet of Aspero is believed to have been primarily maritime because of its close proximity to the Pacific Ocean. Fish hooks and nets have also been found in trash middens and domestic contexts to support this idea. Research at the site led to the controversial "Maritime Foundations of Andean culture" theory, which suggests that the initial development of ancient Peruvian culture was based on fishing, shellfish collecting, and hunting sea mammals, rather than agriculture. The idea is widely disputed by other scholars who claim there is evidence of earlier, inland sites where irrigation agriculture was widespread.