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Ben Amera: (Coordinates 21°14′0″N 13°40′0″W)
After Mount Augustus and Uluru in Australia, Ben Amera is the third largest monolith on planet Earth, about the biggest in Africa. It is situated in the frontier with Western Sahara. It’s rising 630 m / 2070 ft. For a very long time, this one single massive element continues to be the best kept secret. No roads lead directly to it; travelers just need to go by the Nouadhibout-Choum route by the railway. Ben Amera is one of the attractions of Mauritania that one needs to see in person.