The Land of Goshen
The word “best” (מֵיטַב) is only used in two places in the Torah, Genesis 47:6-11 and Exodus 22:5. In the former case, it’s talking about the land of Goshen, “the best” land in Egypt; and in the latter case, it’s talking about “the best vineyards” the Israelites possess.
Starting with the land of Goshen, what makes it the best? Well, geographically, that’s the place in Egypt where the Nile river divides into multiple rivers, thus providing plenty of fresh water and incredibly fertile ground for crops and livestock; and when was the last time we were told about a “good” land where there were many rivers? Obviously, it was in Genesis 2:10-14, where we’re shown a river flowing “out of Eden to water the garden, and there it divided and became four rivers.” Importantly, the garden of Eden is associated with the “vineyard” that Noah plants in Genesis 9:20, which makes sense of why the only other “best” thing described in the Torah is a vineyard!
It’s with this in mind that we can see Genesis 13:10 as an allusion to the land of Goshen, “Lot lifted up his eyes and saw that the Jordan Valley was well watered everywhere like the garden of the Lord, like the land of Egypt.”