Alright, I don't say this much but here it is - The Tour De Sinnar Coast PDF Bundle is a MUST HAVE. No excuses, grab it.
It is in many ways pieces of the puzzle of what is the Lost Lands.
It is also systemless, so no matter what system you prefer this bundle fits your needs.
Did I mention its free?
You get the Sinnar Coast map and Players Guides for:
Cults of the Sundered Kingdoms
Lost City of Barakus