An apocalyptic prophecy in the Book of Zechariah states that YHWH will stand on the Mount of Olives and the mountain will split in two, with one half shifting north and one half shifting south (Zechariah 14:4). According to the Masoretic Text, people will flee through this newly formed valley to a place called Azal (Zechariah 14:5). The Septuagint (LXX) has a different reading of Zechariah 14:5 stating that a valley will be blocked up as it was blocked up during the earthquake during King Uzziah's reign. Jewish historian Flavius Josephus mentions in Antiquities of the Jews that the valley in the area of the King's Gardens was blocked up by landslide rubble during Uzziah's earthquake. Israeli geologists Wachs and Levitte identified the remnant of a large landslide on the Mount of Olives directly adjacent to this area. Based on geographic and linguistic evidence, Charles Simon Clermont-Ganneau, a 19th-century linguist and archeologist in Palestine, theorized that the valley directly adjacent to this landslide is Azal. This evidence accords with the LXX reading of Zechariah 14:5 which states that the valley will be blocked up as far as Azal. The valley he identified (which is now known as Wady Yasul in Arabic, and Nahal Etzel in Hebrew) lies south of both Jerusalem and the Mount of Olives.