Matthew Poole's Concise Commentary
Genesis 10:30
These places were either,
1. In India, where there are places called by Ptolemy and Pliny, Maesae, and Saparum, and Sabara. Or rather,
2. In Arabia, where there was a noted port called Musa; and near it, and eastward from it, a people called Sapharitae, and a royal city called Saphar; from whence this famous and long mountain doth here receive its name. If it be said Arabia is not east but south from Judea, it may be answered,
1. That Arabia, as it is not east in respect of Egypt, where the Jews long dwelt, and part of it is so to Judea also; so it is not seldom in Scripture reckoned as a part of the east country, as appears from Genesis 25:6,18 Jud 6:3 1 Kings 4:30 Job 1:3 Isaiah 11:14 Jeremiah 49:28. And Tacitus describing Judea, saith: It is bounded on the east by Arabia.
2. That this mountain is said to be easterly, not simply, but in respect of the city Mesha, on the east whereof Ptolemy placeth this mountain, though he call it by another name, Climax; add to this, that Moses speaks of these places as known to the Jews, and therefore not so far distant from them as India, a place wholly unknown to them, and wherewith, as yet, they had no communication. If it be further objected, that if these people had been so near and well known to the Jews, we should have had more mention of them in Scripture; I answer, there is mention of some of them; and for others, it is no wonder if by the following wars among nations, and mixtures and confusions of people, some of them were extirpated, and others lost their names, though not their beings, as oft happened.