sink hole

Shisr in South Arabia:

Is Shisr the famed ancient city of Ubar as some have claimed? Or is it something else? This location is in Oman, north of Salalah or is it in southern Jordan.

East of Petra Trade Route:

In his translation of the Xiyu juan, or “Chapter on the Western Regions” from the Hou Han shu, John Hill proposes in his notes (nos. 12.21 and 12.24) that a trade route used to exist …

Ubar:

The legendary city of Ubar was once a center of trade and wealth. According to legends and accounts by early historians, this city was fabulously wealthy as it was located on the overland incense …