Full spoilers ahead for “The iron Throne,” the series finale of Game of Thrones!
Game of Thrones ended with the Starks all going their separate ways following the election of Bran the Broken as the king of the Six Kingdoms (yes, now six), the Iron Throne getting melted down, and Daenerys Targaryen dead. Arya Stark surprised her siblings as they were saying their goodbyes by revealing that she would not return North to Winterfell. Instead, she will venture west of Westeros — a Game of Thrones spinoff we’d all love to see. But what’s west of Westeros anyway? Short answer: no one knows.
Source: IGN.com Game of Thrones: What's West of Westeros?