'Cave' in the Bible

for when Jezebel destroyed the prophets of the Lord, Obadiah took a hundred prophets and hid them by fifties in a cave, and provided them with bread and water.)

Has it not been told to my lord [Elijah] what I did when Jezebel killed the prophets of the Lord, how I hid a hundred of the Lord’s prophets by fifties in a cave, and provided them with bread and water?

There he came to a cave and spent the night in it; and behold, the word of the Lord came to him, and He said to him, “What are you doing here, Elijah?”

When Elijah heard the sound, he wrapped his face in his mantle (cloak) and went out and stood in the entrance of the cave. And behold, a voice came to him and said, “What are you doing here, Elijah?”