The urban area of Heijo-kyo was constructed based on Shimotsu-michi Street and Nakatsu-michi Street of Yamato no kodo (the ancient paths in Yamato Province), which divided the middle part of the Yamato basin into north and south.
平城京の市街区域は、大和盆地中央部を南北に縦断する大和の古道大和の古道下ッ道・大和の古道中ッ道を基準としている。