This is the region ruled by Ish-bosheth after the death of King Saul.
2 Samuel 2:8But Abner son of Ner, commander of Saul’s army, had taken Ish-bosheth son of Saul and brought him over to Mahanaim.2 Samuel 2:9He made him king over Gilead, Ashuri, Jezreel, Ephraim, Benjamin and all Israel.