'Stronghold' in the Bible

Be ashamed, O Sidon;For the sea speaks, the stronghold of the sea, saying,“I have neither travailed nor given birth,I have neither brought up young men nor reared virgins.”

Wail, O ships of Tarshish,For your stronghold is destroyed.

And the multitude of all the nations who wage war against Ariel,Even all who wage war against her and her stronghold, and who distress her,Will be like a dream, a vision of the night.