The Hall of Central Harmony is a smaller, square hall, used by the Emperor to prepare and rest before and during ceremonies. Behind it, the Hall of Preserving Harmony, was used for rehearsing ceremonies, and was also the site of the final stage of the Imperial examination. All three halls feature imperial thrones, the largest and most elaborate one being that in the Hall of Supreme Harmony

The Hall of Supreme Harmony (G) is the largest, and rises some 30 metres (98 ft) above the level of the surrounding square. It is the ceremonial centre of imperial power, and the largest surviving wooden structure in China. It is nine bays wide and five bays deep, the numbers 9 and 5 being symbolically connected to the majesty of the Emperor. Set into the ceiling at the centre of the hall is an intricate caisson decorated with a coiled dragon, from the mouth of which issues a chandelier-like set of metal balls, called the "Xuanyuan Mirror". In the Ming dynasty, the Emperor held court here to discuss affairs of state. During the Qing dynasty, as Emperors held court far more frequently, a less ceremonious location was used instead, and the Hall of Supreme Harmony was only used for ceremonial purposes, such as coronations,investitures, and imperial weddings

Entering from the Meridian Gate, one encounters a large square, pierced by the meandering Inner Golden Water River, which is crossed by five bridges. Beyond the square stands the Gate of Supreme Harmony (F). Behind that is the Hall of Supreme Harmony Square. A three-tiered white marble terrace rises from this square. Three halls stand on top of this terrace, the focus of the palace complex. From the south, these are the Hall of Supreme Harmony (太和殿), theHall of Central Harmony (中和殿), and the Hall of Preserving Harmony(保和殿

Traditionally, the Forbidden City is divided into two parts. The Outer Court (外朝) or Front Court (前朝) includes the southern sections, and was used for ceremonial purposes. The Inner Court (内廷) or Back Palace (后宫) includes the northern sections, and was the residence of the Emperor and his family, and was used for day-to-day affairs of state. (The approximate dividing line shown as red dash in the plan above.) Generally, the Forbidden City has three vertical axes. The most important buildings are situated on the central north–south axis

The Meridian Gate has two protruding wings forming three sides of a square (Wumen, or Meridian Gate, Square) before it. The gate has five gateways. The central gateway is part of the Imperial Way, a stone flagged path that forms the central axis of the Forbidden City and the ancient city of Beijing itself, and leads all the way from theGate of China in the south to Jingshan in the north. Only the Emperor may walk or ride on the Imperial Way, except for the Empress on the occasion of her wedding, and successful students after the Imperial Examination

The wall is pierced by a gate on each side. At the southern end is the mainMeridian Gate (A). To the north is the Gate of Divine Might (B), which faces Jingshan Park. The east and west gates are called the "East Glorious Gate" (D) and "West Glorious Gate" (C). All gates in the Forbidden City are decorated with a nine-by-nine array of golden door nails, except for the East Glorious Gate, which has only eight rows 

At the four corners of the wall sit towers (E) with intricate roofs boasting 72 ridges, reproducing the Pavilion of Prince Teng and the Yellow Crane Pavilionas they appeared in Song dynasty paintings. These towers are the most visible parts of the palace to commoners outside the walls, and much folklore is attached to them. According to one legend, artisans could not put a corner tower back together after it was dismantled for renovations in the early Qing dynasty, and it was only rebuilt after the intervention of carpenter-immortalLu Ban

The Forbidden City is surrounded by a 7.9 metres (26 ft) high city wall and a 6 metres (20 ft) deep by 52 metres (171 ft) wide moat. The walls are 8.62 metres (28.3 ft) wide at the base, tapering to 6.66 metres (21.9 ft) at the top. These walls served as both defensive walls and retaining walls for the palace. They were constructed with a rammed earth core, and surfaced with three layers of specially baked bricks on both sides, with the interstices filled with mortar.

The Forbidden City remains important in the civic scheme of Beijing. The central north–south axis remains the central axis of Beijing. This axis extends to the south through Tiananmen gate to Tiananmen Square, the ceremonial centre of the People's Republic of China, and on to Yongdingmen. To the north, it extends through Jingshan Hill to the Bell and Drum Towers.[37] This axis is not exactly aligned north–south, but is tilted by slightly more than two degrees. Researchers now believe that the axis was designed in theYuan dynasty to be aligned with Xanadu, the other capital of their empire

The Forbidden City is a rectangle, with 961 metres (3,153 ft) from north to south and 753 metres (2,470 ft) from east to west. It consists of 980 surviving buildings with 8,886 bays of rooms. A common myth states that there are 9,999 rooms including antechambers, based on oral tradition, and it is not supported by survey evidence. The Forbidden City was designed to be the centre of the ancient, walled city of Beijing. It is enclosed in a larger, walled area called theImperial City. The Imperial City is, in turn, enclosed by the Inner City; to its south lies the Outer City.