Road between McCaslin and Beauchamp Plantations (Location Key)

In Go Down, Moses the McCaslin and Beauchamp plantations are "twenty-two miles" - half a day's ride - apart (287). The route between them includes "the long flat" section "about three miles" from the Beauchamps (10). We assume the road between them is essentially a continuation of the 'northeast road' that leads to the McCaslin place from Jefferson, but the novel doesn't say enough about the location of the "Warwick" - as Sophonsiba Beauchamp wants us to call her and her brother's plantation - to be sure of that (11).