He continued exploring the area and discovered many of the features reported by the ancient Greek historian Diodorus. While Koldewey was convinced that he had found the gardens, some modern archaeologists have called his discovery into question. While the location of the site that Koldewey excavated was well known and recognised as where Babylon had been situated, they argue that the dig site was too far from the Euphrates River to have been irrigated with the amount of water required for a green garden, and the ancient Greek historian Strabo stated that the Hanging Gardens were located right next to the river. The complex of arched rooms that Koldewey discovered was most likely a storeroom, as cuneiform tablets with lists of supplies and rations were later found in the ruins.