The city's growth was helped by its excellent location, based on at least two factors: it had control over strategic and trading routes along the Tigris, and it had an abundance of water in a dry climate. Water exists on both the north and south ends of the city, allowing all households to have a plentiful supply, which was quite uncommon during this time. The city of Baghdad quickly became so large that it had to be divided into three judicial districts: Madinat al-Mansur (the Round City), al-Sharqiyya (Karkh) and Askar al-Mahdi (on the West Bank).