The king of Dor in the coast of Dor, one; the king of the nations of Gilgal, one;

Wesley's Notes

12:23 King of Gilgal - Not of that Gilgal where Joshua first lodged after his passage over Jordan; where it doth not appear, that there was either king or city; but of a city of the same name, probably in Galilee towards the sea, where divers people might possibly resort for trade and merchandise, over whom this was a king, as formerly Tidal seems to have been, Gen 14:1.

Matthew Henry's Concise Commentary

12:7-24 We have here the limits of the country Joshua conquered. A list is given of the kings subdued by Israel: thirty-one in all. This shows how fruitful Canaan then was, in which so many chose to throng together. This was the land God appointed for Israel; yet in our day it is one of the most barren and unprofitable countries in the world. Such is the effect of the curse it lies under, since its possessors rejected Christ and his gospel, as was foretold by Moses, De 29:23. The vengeance of a righteous God, inflicted on all these kings and their subjects, for their wickedness, should make us dread and hate sin. The fruitful land bestowed on his chosen people, should fill our hearts with hope and confidence in his mercy, and with humble gratitude.