AMMAH (ām'a, Heb. ’ammâh, mother, or beginning). A hill facing Giah by way of the wilderness of Gibeon, where Joab and Abishai stopped at sundown in their pursuit of Abner after Asahel’s death (2Sam.2.24).

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AMMAH ăm’ ə (אַמָּ֔ה). A hill near Giah in Benjamin, in the wilderness of Gibeon, where Joab and Abishai halted in their pursuit of Abner and his forces after they defeated him in the battle of Gibeon (2 Sam 2:24-32). After a truce was made, the two forces returned to their headquarters. The site is unknown.

International Standard Bible Encyclopedia (1915)

A hill in the territory of Benjamin (2Sa 2:24), where Joab and Abishai halted at nightfall in their pursuit of Abner and his forces after their victory over him in the battle of Gibeon. It "lieth before Giah by the way of the wilderness of Gibeon"; but the exact location has not been identified. The same Hebrew word appears as the second part of Metheg-ammah in 2Sa 8:1 the King James Version, but rendered "mother city" in the Revised Version (British and American), probably however not the same place as in 2Sa 2:24.