Asshai is on the easternmost edge of the known map. So the most logical explanation for Sun Chaser winding up there would be if it actually did made it past the edge of the world to the west, circumventing the globe to arrive on the other side of Essos. - Mashable
In Season 7, the map of the opening credits sequence didn't feature a single location across the Narrow Sea for the first time in Thrones history. Now, in Season 8, the map is limited to just
Ulthos is the smallest, the least-known and most obscure of the known world's four continents. It is located south of Asshai and the Shadow Lands and east of Sothoryos. The continent forms the south-eastern coastline of the Jade Sea. Ulthos is separated from Asshai and the Shadow Lands by the Saffron Straits, which link the Jade Sea to as-yet unknown seas further east. The island of Ulos lies
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game of thrones map essos