Nehemiah 2:13 (BSB)

So I went out at night through the Valley Gate toward the Well of the Serpent and the Dung Gate, and I inspected the walls of Jerusalem that had been broken down and the gates that had been destroyed by fire.

From Nehemiah 2. Also in the ESV.

Commentary on Nehemiah 2:13

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Nehemiah 2:9-20: We are here told, I. Now Nehemiah was dismissed by the court he was sent from. The king appointed captains of the army and horsemen to go with him (Neh 2:9), both for his guard and to show that he was a man whom the king did delight to honour, that all the king's servants might respect him accordingly.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Nehemiah 2:13: Then I went on to the pool of the fountain, and to the king's pool..... That led to the fountain Siloah or Gihon, so called; it was the way to the potter's field, to Bethlehem, Hebron, Gaza, and Egypt. Rauwolff says (t) there is still standing on the outside of the valley Tyropaeum (which distinguishes the two mountains Zion and Moriah) the gate of the...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Nehemiah 2:13: I went out by night by the gate of the valley--that is, the Jaffa gate, near the tower of Hippicus. even before the dragon well--that is, fountain on the opposite side of the valley. and to the dung port--the gate on the east of the city, through which there ran a common sewer to the brook Kedron and the valley of Hinnom.
• Adam Clarke (Methodist), Clarke's Commentary on the Bible on Nehemiah 2:13: 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.