Well, I dug up the site I was referring to....
This is all that I could really find about Harad, more specifically near Harad (as neither far Harad, nor the peoples inhabiting it, were ever described in any great detail in any of Tolkien's works).
Not really much there as to the exact sites this place could have represented, if any....
....and Umbar....
So it seems that, although this place sounds very similiar to Ubar, it may well have had other meanings (Such as meaning "not home" or it being the elvish word for 'fate' coinciding with the place which was the beginning of the end for Numenor (which, if you know anything about Tolkien history, was supposedly a nation unmatched in power and beauty before it was cast into the sea by the gods, which is suprisingly similar to the legend of Atlantis).
Tolkien was trying to create a british mythology which was as rich as greek mythology, so I think he pulled aspects from all parts of his world....real life, legends and myths, his own imagination, etc.
The site can be found
here if you're interested. It's quite good.

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