2 Samuel 2:9
And made him king over Gilead, and over the Ashurites, and over Jezreel, and over Ephraim, and over Benjamin, and over all Israel. And made him king over Gilead, and over the Ashurites, and over Jezreel, and over Ephraim, and over Benjamin, and over all Israel.
After Judah acknowledged David as king, Abner set up Ishbosheth as a rival king over much of Israel, dividing the kingdom and directly challenging David's authority. His rule began among the tribes east of the Jordan and then extended to the listed territories of Gilead, the Ashurites, Jezreel, Ephraim, and Benjamin, until it eventually covered all Israel except Judah. He was crowned at Mahanaim. That site was chosen because it offered security from both David and the Philistines.