'In the Wilderness' in the Bible

About that time John the Baptist first appeared, proclaiming in the Wilderness of Judea:

This is he who was spoken of in the Prophet Isaiah, where he says--'The voice of one crying aloud in the Wilderness: "Make ready the way of the Lord, Make his paths straight."'

Therefore, if people say to you 'He is in the Wilderness!', do not go out there; or 'He is in an inner room!', do not believe it;