Gehenna

Gehenna is a valley around Jerusalem. In the Hebrew Bible it is known as the Valley of the Son of Hinnom. The Valley of Hinnom is the modern name for the valley surrounding the Old City of Jerusalem, including Mount Zion. It meets the Kidron Valley near the southeastern corner of the city. It ends near Mamilla neighbourhood in the west.
An ancient river, Gai Ben-Hinnom, passes through the valley.