'Strongholds' in the Bible

And the men of Israel saw that they were in a strait (for the people were distressed); and the people hid themselves in caves, and in thickets, and in cliffs, and in strongholds, and in pits.

David then stayed in the wilderness strongholds and in the hill country of the Wilderness of Ziph. Saul searched for him every day, but God did not hand David over to him.

Some Ziphites came up to Saul at Gibeah and said, “David is hiding among us in the strongholds in Horesh on the hill of Hachilah south of Jeshimon.

From there David went up and stayed in the strongholds of En-gedi.