"Tywin: You're quite smart for your age.
Arya: I've read the Great Journey into the Waste four times when I was eight."
―Tywin and Arya at Harrenhal, discussing the Great Journey
The Great Journey into the Waste is a book detailing the journey of Asterion the Black and the history of House Blackgard, including the lineage and appearance of all his heirs until Eddin Blackgard. It was written by Archmaester Donaphos.

The book is divided in two different parts. The first part tells the story of Asterion's journey into the Borderlands through a narrative prose. The second part details all of Asterion's heirs until Eddin's generation, which is told more like a chronicle instead of a narrative. Steffon Blackgard's generation is not mentioned in the book.