What is the realm of the dwarves?

The story behind the answer

Svartalfheim is the realm of the dwarves—the “home of the black-elves” (svart = black), reflecting their subterranean world. In Norse tales, dwarves are master smiths who forged legendary items like Thor’s hammer Mjölnir and Odin’s spear Gungnir, working in the deep, dark places of the earth.

For context, Alfheim is the land of the light-elves, and Muspell