The gate Nehemiah used to exit and reenter when he inspected the walls of Jerusalem (Nehemiah 2:13–14). It was on the west side of the city facing the Tyropeon Valley. King Uzziah is said to have built and strengthened a tower at this gate (2 Chronicles 26:9).
Valley Gate
From Tyndale Bible Dictionary, adapted by Mission Mutual. CC BY-SA 4.0.