Jamieson, Fausset and Brown on Isaiah 60:6

6. camels--laden with merchandise; the camel is "the ship of the desert" (compare Is 30:6).

cover thee--so many of them shall there be.

dromedaries--They have one hunch on the back, whereas the camel has two: distinguished for swiftness (Jr 2:23).

Midian--east of the Elanitic branch of the Red Sea, and stretching northward along Mount Seir. Associated with the Ishmaelites in traffic (Ge 37:25, 28).

Ephah--part of Midian, east of the Dead Sea. It abounded in camels (Jud 6:5).

Sheba--in Arabia-Felix, famed for frankincense and gold (Psa 72:15; Jr 6:20), which they traded in (Is 45:14; Job 6:19; Eze 27:22).