Its identification with the Kidron Valley, which began in the fourth century, is somewhat uncertain since no actual valley of this name is known to pre-Christian antiquity. Eusebius in the Onomasticon (ed. Klostermann, p. 70) located the valley of Jehoshaphat in the Valley of Hinnom, possibly because of the judgments that were associated with that place in connection with the idolatrous kings of Judah (cf. Jer. Jer. 7:31f; Jer. 19:5f, where it is called the valley of Slaughter). Since the time of the Pilgrim of Bordeaux (A.D. 333), however, the Kidron has become increasingly the site popularly accepted.4
2 Joel Joel 3:2, Joel 3:13 speaks of events taking place in the valley of Jehoshaphat, which seems to be an extended area east of Jerusalem.J. Dwight Pentecost, Things to Come: A Study in Biblical Eschatology (Grand Rapids, MI: Zondervan Publishing House, 1958), 341.