At its height the city covered over NUMBER@1 km ² -LRB- over NUMBER@2 NUMBER@3 square miles -RRB- , and probably housed a population of over NUMBER@4 people , possibly as many as NUMBER@5 .

At its height the city covered over NUMBER@1 km ² -LRB- over NUMBER@2 NUMBER@3 square miles -RRB- . It probably housed a population of over NUMBER@4 people , possibly as many as NUMBER@5 .
