Underground Science #214 - Down the Drain

Reddit post: https://www.reddit.com/r/geology/comments/12ly61q/as_seen_in_petra_jordan_could_someone_please/

Videos:
Bottom Line Up Front, "You Don't Need a Tour Guide at Petra Jordan (Secret Access Points)": https://www.youtube.com/watch?v=iqGedUZbvWA

Earth Enchantment, "The Lost City of Petra 🇯🇴": https://www.youtube.com/watch?v=GN8RddJ8bdU

DW Travel, "@dhruvrathee visits Ancient Petra, in Jordan | How to Avoid the Tourist Traps": https://www.youtube.com/watch?v=-lEiXA1isJw

Google Maps Image by Daniele Montagna: https://goo.gl/maps/7eLVx2vdh1biLKiN7