Charles Ellicott Commentary Genesis 10:19-20

"And the border of the Canaanite was from Sidon, as thou goest toward Gerar, unto Gaza; as thou goest toward Sodom and Gomorrah and Admah and Zeboiim, unto Lasha. These are the sons of Ham, after their families, after their tongues, in their lands, in their nations." — Genesis 10:19-20 (ASV)

The border ... — The boundaries given are Sidon in the north, Gerar and Gaza in the south and southwest, and from there to the Dead Sea. The only Lasha known is a place famous for its hot springs on the east of the Red Sea. Although the Phoenicians may have occupied this town on their way to Palestine, it could not have been one of their boundaries. Consequently, it was probably some place destroyed in the convulsion which overthrew the cities of the plain. We must also notice that, while Sidon is, Aradus and Hamath were considerably above it. It is probable, therefore, that both the Arvadite and the Hamathite were still wandering tribes without settlements when this table was drawn up.