'Strongholds' in the Bible

David stayed in the wilderness in the strongholds, and he lived in the hill country in the wilderness of Ziph. Saul sought him every day, but God did not let David slip into Saul's control.

People from Ziph came up to Saul at Gibeah and informed him, "David is hiding with us in the strongholds in Horesh and on the hill of Hachilah south of Jeshimon, isn't he?

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