All draining canals inside the Forbidden City lead to the Inner Golden Water River, which connects with a 52-meter-wide moat outside the Forbidden City, and is linked to the Outer Golden Water River and other water systems in Zhongnanhai.
而故宫内的排水沟渠全部通向内金水河，内金水河又与故宫城墙外侧52米宽的护城河相连，并同周边的外金水河、中南海等水系相通。