Which Old English epic poem is set mainly in Scandinavia?

The Old English epic poem set mainly in Scandinavia is Beowulf.

Although Beowulf was composed in England in the Old English period, its story takes place across the Scandinavian world. Beowulf is a Geat who travels from his homeland—usually associated with southern Sweden—to Denmark, where he helps King Hrothgar defend the mead hall Heorot from the monster Grendel and later Grendel’s mother.

The poem then returns to Geatland. In its final section, Beowulf is an aging king who fights a dragon and dies from his wounds. The settings and dynasties are legendary, but several peoples and rulers mentioned in the poem have possible parallels in early medieval Scandinavian history.

A common mix-up is assuming that an English-language epic must be set in England. Beowulf’s surviving manuscript is English, and the poem is central to Old English literature, yet England is mostly absent from its narrative geography. Its anonymous author probably shaped older Germanic traditions for an English audience.