camels - laden with merchandise; the camel is “the ship of the desert” (compare Isa 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 (Jer 2:23).
Midian - east of the Elanitic branch of the Red Sea, and stretching northward along Mount Seir. Associated with the Ishmaelites in traffic (Gen 37:25, Gen 37:28).
Ephah - part of Midian, east of the Dead Sea. It abounded in camels (Jdg 6:5).
Sheba - in Arabia-Felix, famed for frankincense and gold (Psa 72:15; Jer 6:20), which they traded in (Isa 45:14; Job 6:19; Eze 27:22).