West of one and south of another
It was itself divided into two
Home to the First and even before
It was mostly lost in the Great War
Beleriand
Beleriand was the region of north-western Middle-earth during the First Age. Originally, the name belonged only to the area around the Bay of Balar, but in time the name was applied to the entire land. (Source: The Silmarillion)
Tolkien Gateway: Beleriand