'City wall' in the Bible

So he took his firstborn son, who was to become king in his place, and offered him as a burnt offering on the city wall. Great wrath was on the Israelites, and they withdrew from him and returned to their land.

While the king of Israel was passing by on the city wall, a woman shouted to him, "Help us, my master, O king!"

When the king heard what the woman said, he ripped his garments as he continued walking along the city wall. As the people watched, all of a sudden they noticed he was wearing sackcloth underneath his clothes, inside next to his flesh!