The description of the territories of Gad and the half tribe of Manasseh simply describe the geographical location of each. While this appears to be just a record-keeping passage, perhaps similar to a deed or survey, it gives us the orderly fashion in which God carries out His business. Each tribe was to receive an inheritance commensurate with the population of said tribe. God carried out His promise with precision and care, just as He does the business of our lives. He is trustworthy and thorough!