Swollen heap, fountain of ebullition (bubbling over)
Strong's Concordance #H1533
Mount Gilboa is actually a range of mountains located in the land originally given to the tribe of Manasseh. In modern times, the range's highest peak rises to a height of about 1,627 feet (496 meters).
And the Philistines gathered themselves together, and came and pitched in Shunem: and Saul gathered all Israel together, and they pitched in Gilboa.
1Samuel 31:1, 18
Now the Philistines fought against Israel: and the men of Israel fled from before the Philistines, and fell down slain in mount Gilboa.
And it came to pass on the morrow, when the Philistines came to strip the slain, that they found Saul and his three sons fallen in mount Gilboa.
2Samuel 1:6, 21
And the young man that told him said, As I happened by chance upon mount Gilboa, behold, Saul leaned upon his spear: and, lo, the chariots and horsemen followed hard after him.
Ye mountains of Gilboa, let there be no dew, neither let there be rain, upon you, nor fields of offerings: for there the shield of the mighty is vilely cast away, the shield of Saul, as though he had not been anointed with oil.
And David went and took the bones of Saul and the bones of Jonathan his son from the men of Jabeshgilead, which had stolen them from the street of Bethshan, where the Philistines had hanged them, when the Philistines had slain Saul in Gilboa.