Where was Ubar?What was Ubar like?

Question

Where was Ubar?What was Ubar like?

Answer 1

Ubar was mentioned in ancient records, in its Arabic form "Erum", and was spoken of in folk tales as a trading center of the Rub al-Khali Desert in the southern part of the Arabian peninsula. It is estimated that it lasted from about 3000 B.C to the first century A.D. According to legends, it became fabulously wealthy from trade between the coastal regions and the population centers of the Middle-East and Europe. The city became lost to modern history, and was thought to be only a figment of mythical tales.

The Qur'an says that Erum was a city inhabited by the tribe of 'Ad:

Answer 2

It was a mythical place in a Borges story, but after some cursory googling, I find it was real:

http://www2.ups.edu/faculty/velez/FL380/...

neat!  Although, given Borges' proclivities, it's possible that this is an elaborate joke.