Joshua 12:3 - Matthew Poole's English Annotations on the Holy Bible

To the sea of Chinneroth on the east; which words describe the situation not of the sea of Chinneroth, which was part of the western border of Sihon's dominion, but of the plain, which is here said to lie eastward from the sea of Chinneroth, and also eastward from the Salt Sea, as it here follows. And this was indeed the situation of the plains of Moab, which are here spoken of, to wit, that they lay between the two seas, that of Chinneroth and the Salt Sea, and eastward to them both. The sea of the plain; the Salt Sea is so called because it was a famous plain, pleasant and fruitful, before it was turned into a salt sea. From the south, or, on or towards the south.