The Daidairi (the greater imperial palace) occupied the northernmost central position, and the Suzaku-oji Avenue (main avenue of Heian-kyo) was laid out from there to the center of the city, so as to bisect into Sakyo (left city) and Ukyo (right city) (Sakyo is on the east side and Ukyo is on the west side).
都の北端中央に大内裏を設け、そこから市街の中心に朱雀大路を通して左右に左京・右京（東側が左京、西側が右京である）を置くという