'Recesses' in the Bible

He came to the sheepfolds on the way, where there was a cave; and Saul went in to relieve himself. Now David and his men were sitting in the inner recesses of the cave.

“Have you entered into the springs of the seaOr walked in the recesses of the deep?

“But you said in your heart,‘I will ascend to heaven;I will raise my throne above the stars of God,And I will sit on the mount of assemblyIn the recesses of the north.

“Nevertheless you will be thrust down to Sheol,To the recesses of the pit.