This is where the Bedouin community lives. For generations, many Bedouin families lived in the caves of Petra, but in the early '80s they were moved to the houses built by the government at Umm Sayhoon.
If you are leaving at the end of the afternoon you will probably find yourself walking with the Bedouin people who have been selling crafts, horse rides and refreshments all day. Don't be surprised if you strike up conversations; as very few tourists ever leave by this exit, you will be a curiosity. You may even be invited home for tea.