I'm reading (listening) to A Memory of Light, and in Chapter 20...

> 
> ...an army of "Sharans" appears out of nowhere.
> 
> 
> 

I have absolutely no recollection of this country or people. Clearly, I missed or forgot something from a previous book.

In what chapter was Shara introduced, and/or what chapter would provide some good background on the people? To be clear, I don't want to know what Shara is, I'd like a reference to the original material.