The World of Ice and Fire: The Official History of Westeros and The World of A Game of Thrones by GRR Martin
A thought I had, I wonder if GRR Martin will ever set a story in Sothoryos? Its barely explored, and is said to be a haven for disease and is covered in jungles and deserts and has ape like creatures and "terrible walking lizards with scythes for claw" on it. That sounds like a killer setting for a story. Maybe a single book after A Song of Ice and Fire is completed set a hundred years or so after the current time period or in the past. Maybe a lord commisioned a voyage there looking for something or to colonize.