A moratorium is in effect on adding information from Fire and Blood until December 20th.
Ulos is an island in far eastern Essos.
It is a mountainous isle located in the Saffron Straits, between Ulthos and the Shadow Lands.
An unnamed ruined settlement is located slightly inland from the northern shore. It is the easternmost island in the known world.
Ulos has not yet been mentioned in A Song of Ice and Fire, only appearing in The Lands of Ice and Fire and A World of Ice and Fire.