What is "midgarth"

Midgard \Mid"gard\ (m[i^]d"g[aum]rd), n. Also Midgarth \Mid"garth\ (-g[aum]r[th]), Mithgarthr \Mith"garthr\ (Icel. m[-e][th]"g[aum]r[th]r'). [Icel. mi[eth]gar[eth]r.] (Teut. Myth.) The middle space or region between heaven and hell, the abode of human beings; the earth.

Midgarth, also known as the Holm of Midgarth and Linga Holm is an uninhabited Scottish island extending to approximately situated west of Stronsay island in the Orkney archipelago. The name "Linga Holm" is derived from the Old Norse Lyngholm.