Adam Clarke, on Neh 2:13

“And I went out by night by the gate of the valley, and before the dragon fountain, and to the dung gate, and I viewed the wall of Jerusalem which was broken down, and the gates thereof which were consumed with fire.”

“The dragon well - Perhaps so called because of the representation of a dragon, out of whose mouth the stream issued that proceeded from the well. Dung port - This was the gate on the eastern side of the city, through which the filth of the city was carried into the valley of Hinnom.”

Imported from an open dataset — not yet checked against the printed edition.