King Sihon's land was between Moab and Ammon. God would not allow the Israelites to invade Ammon, Edom, or Moab (Deuteronomy 2:19; Deuteronomy 2:4–9). This was because they were relatives (Genesis 19:30–38; 32:3). Yet, Israel needed to cross Transjordan (the region across the Jordan River) to enter Canaan. Sihon's territory was the natural route.