Jamieson, Fausset and Brown on 1 Samuel 28:4

4. the Philistines ... pitched in Shunem--Having collected their forces for a last grand effort, they marched up from the seacoast and encamped in the "valley of Jezreel." The spot on which their encampment was fixed was Shunem (Jos 19:18), now Sulem, a village which still exists on the slope of a range called "Little Hermon." On the opposite side, on the rise of Mount Gilboa, hard by "the spring of Jezreel," was Saul's army--the Israelites, according to their wont, keeping to the heights, while their enemies clung to the plain.

1Sa 28:7-25. Saul Seeks a Witch, Who, Being Encouraged by Him, Raises Up Samuel.