TSK · Numbers 34:12

Lot looked up and saw the whole region of the Jordan. He noticed that all of it was well-watered(before the LORD obliterated Sodom and Gomorrah) like the garden of the LORD, like the land of Egypt, all the way to Zoar.

Then the LORD rained down sulfur and fire on Sodom and Gomorrah. It was sent down from the sky by the LORD.

your southern border will extend from the wilderness of Zin along the Edomite border, and your southern border will run eastward to the extremity of the Salt Sea,

The eastern border was the Salt Sea to the mouth of the Jordan River. The northern border started north of the Salt Sea at the mouth of the Jordan,