Biblical Sirens: Isaiah 43, 20

The fourth appearance of sirens in the Septuagint is particularly interesting for us, I think:

Behold I will do a new thing;
now it shall become visible:
I will even make a way in the wilderness
and rivers in the desert.
Then shall the beasts of the field praise me
the sirens and the daughters of the ostriches,
because I give waters in the wilderness.

It's the combination of the sirens and the river that struck me particularly! The river here is a blessing (as it is in Gilfillan's quotation from Isaiah - well, actually, it's used there to figure the peace that would have followed from obedience to God's commandments). And this river waters the wilderness which is home to the sirens.