DICT.TW Dictionary Taiwan

 En-rogel
    fountain of the treaders; i.e., "foot-fountain;" also called the
    "fullers' fountain," because fullers here trod the clothes in
    water. It has been identified with the "fountain of the virgin"
    (q.v.), the modern 'Ain Ummel-Daraj. Others identify it, with
    perhaps some probability, with the Bir Eyub, to the south of the
    Pool of Siloam, and below the junction of the valleys of Kidron
    and Hinnom. (See FOUNTAIN.)
      It was at this fountain that Jonathan and Ahimaaz lay hid
    after the flight of David (2 Sam. 17:17); and here also Adonijah
    held the feast when he aspired to the throne of his father (1
    Kings 1:9).
      The Bir Eyub, or "Joab's well," "is a singular work of ancient
    enterprise. The shaft sunk through the solid rock in the bed of
    the Kidron is 125 feet deep...The water is pure and entirely
    sweet, quite different from that of Siloam; which proves that
    there is no connection between them." Thomson's Land and the
    Book.

 En-rogel, the fuller's fountain; the well of searching