In the Yuan Dynasty, the capital and its surrounding areas were called "hinterland" (that is, the land of the central government), including Hebei, Shandong, Shanxi and parts of Henan and Inner Mongolia, which were directly under the jurisdiction of Zhongshu Province and did not belong to any province.

In the Yuan Dynasty, Zhongshu Province set Zhongshu Order as the highest official, with Zhongshu Prime Minister in charge of national politics. In addition to being a decision-making body, the library department is also responsible for directly managing the hinterland near the capital metropolis. Outside the hinterland, there are provincial books in all provinces of China, referred to as provincial books for short.

Extended data:

In the first year of reunification (1260), after Kublai Khan ascended the throne, he adopted the central plains official system and established the Zhongshu province with the prime minister as the highest administrative body of state affairs. His official position follows the Jin Shangshu provincial system, and the official position is concurrently held by the Crown Prince, and he is absent when there is no Crown Prince. The actual chief executive is the right prime minister, the left prime minister (yuan system is still right, so right is above left), or just the right prime minister, who always saves trouble and commands a hundred divisions. There are six books in Zhongshu Province.

In the Yuan Dynasty, Zhongshu Province also had some institutions (a special administrative agency and a government agency) in the distance, that is, the provinces' Zhongshu Province (referred to as the province for short), later referred to its jurisdiction, and later referred to local provinces (but Zhongshu Province itself did not refer to its direct jurisdiction).

Baidu Encyclopedia-Zhongshu Province in Yuan Dynasty