Midgaad may be translated as 'Mid' or 'Middle Earth' a world where magic exists, but is not particularly strong, where demigods walk among men, but take little action.
Midgaad is where the Sindarin of Hârn may have originated, and possibly the Khuzdul as well.
To reach the Blessed Realm, some Sindârin came by way of Kethira, and some chose to remain there, at least temporarily. The reason for the Khúzan migration to Kethîra is more obscure. Some Khúzan myths describe sweeping wars in Midgaad between the forces of good and evil.