Adam Clarke's Commentary on the Bible - Isaiah 21:1
The desert of the sea - This plainly means Babylon, which is the subject of the prophecy. The country about Babylon, and especially below it towards the sea, was a great flat morass, overflowed by the Euphrates and Tigris. It became habitable by being drained by the many canals that were made in it. Herodotus, lib. 1:184, says that "Semiramis confined the Euphrates within its channel by raising great dams against it; for before it overflowed the whole country like a sea." And Abydenus,... read more
John Gills Exposition of the Bible Commentary - Isaiah 21:10
O my threshing, and the corn of my floor ,.... Which may be understood either of the Babylonians, now threshed or punished by the Lord, and whom he had made use of as instruments for the punishment of others; or rather of the people of the Jews, whom the prophet calls "his", as being his countrymen, to whom he was affected, and with whom he sympathized; and besides, he speaks in the name of the Lord; or it is the Lord that speaks by him, calling the church of the Jews his floor, and the... read more