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Each light is one place named in the Bible, set at its most likely location. The bigger the light, the more verses name that place. Its colour is the section of the Bible that names it first.
Arise, walk through the land in the length of it and in the breadth of it; for unto thee will I give it.Genesis 13:17 (ASV)
OpenBible.info's Bible Geocoding Data lists 1,342 places named in the Bible. For each place it lists every location that scholars have proposed, with a score out of 1,000 for how confident scholarship is. 500 or more means at least 50% confident.
The land is the coastline only: no borders and no modern names. The area of each light grows with the number of verses that name the place. Colour is the section that names it first, reading in Tanakh order.
Where scholars are unsure, the place is left off rather than guessed. Journeys and borders are not drawn.