What does Isaiah 18:2 mean?

that sendeth ambassadors by the sea, even in vessels of papyrus upon the waters, saying, Go, ye swift messengers, to a nation tall and smooth, to a people terrible from their beginning onward, a nation that meteth out and treadeth down, whose land the rivers divide!

That sendeth ambassadors by the sea, even in vessels of bulrushes upon the waters, saying, Go, ye swift messengers, to a nation scattered and peeled, to a people terrible from their beginning hitherto; a nation meted out and trodden down, whose land the rivers have spoiled!

that sendeth ambassadors by the sea, even in vessels of papyrus upon the waters, saying, Go, ye swift messengers, to a nation tall and smooth, to a people terrible from their beginning onward, a nation that meteth out and treadeth down, whose land the rivers divide!

Which sends its representatives by the sea, even in ships of papyrus on the waters. Go back quickly, O representatives, to a nation tall and smooth, to a people causing fear through all their history; a strong nation, crushing down its haters, whose land is cut through by rivers.

That is sending by sea ambassadors, Even with implements of reed on the face of the waters, --Go, ye light messengers, Unto a nation drawn out and peeled, Unto a people fearful from its beginning and onwards, A nation meeting out by line, and treading down, Whose land floods have spoiled.

That sendeth ambassadors by the sea, and in vessels of bulrushes upon the waters. Go, ye swift angels, to a nation rent and torn in pieces: to a terrible people, after which there is no other: to a nation expecting and trodden underfoot, whose land the rivers have spoiled.

that sendest ambassadors over the sea, and in vessels of papyrus upon the waters, [saying,] Go, swift messengers, to a nation scattered and ravaged, to a people terrible from their existence and thenceforth; to a nation of continued waiting and of treading down, whose land the rivers have spoiled!