from an unused root thought to mean to break through; a boiling spring; Lesha, a place probably East of the Jordan; Lasha.
Usages throughout the bible
Genesis 10:19
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And the border of the Canaanites was from Sidon, as thou comest to Gerar, unto Gaza; as thou goest, unto Sodom, and Gomorrah, and Admah, and Zeboim, even unto Lasha. H3962