Located alongside the gentle slopes of the surrounding small hills, the A Po Ieong Site is situated in the northern part of Hac Sa Beach. Between late 2006 and early 2007, the Macao Museum of Art invited archaeologists from Guangdong and Hong Kong to re-examine the site that had been archaeologically surveyed previously, in 1972, finding that A Po Ieong in the northern part of Hac Sa remained unchanged, so they commenced a trial excavation.
Numerous stone tools and pottery was unearthed at the site, including stone net weights, a stone anchor, stone adzes, stone flakes and quartz ring cores associated with the production of quartz rings and slotted rings, fragments of coarse pottery and clay pottery. The stone anchor and the large number of uneathed stone net weights indicate that the prehistoric inhabitants of this area were already fishing and carrying out other related activities.
Based on the geographical setting of the site and the comparative analysis of the decorative patterns of the pottery unearthed, it is estimated that the site dates from around 4,500 to 4,000 years ago, which therefore places it the Late Neolithic period.