What do we Know of the Lands North of yi ti and asshai Beyond the five forte ? Thank you

Very little. There is the steppe of the Jogos Nhai, the small kingdom of the N’ghai, the forests of Mossovy, but everything to the east of the Bleeding Sea gets really weird…there’s the Land of the Shrykes, the mysterious city of K’dath and its mad gods, Bonetown which lives off of paleontology, the Cities of the vampiric Bloodless Men, Carcosa ruled over by its yellow emepror, the City of the Winged Men, but beyond that the Grey Wastes and the Cannibal Sands stretch off into the blank spaces of all maps.