Four altars: refers to the Temple of Heaven, Ditan, Ritan and Moon Altar.
Juyongguan: refers to Juyongguan.
In the northwest of Beijing. At the beginning of Liao Dynasty, Yuquan landscape was introduced and merged into the pond. Gold is called Xihuatan, and Yuan is called Taiye Pool. The pool spans the long bridge, with the North Sea in the north and the China Sea and the South China Sea in the south, which are collectively called the "Three Seas". See Long Live the Mountain by Tao in Ming Dynasty. 1 In today's Jingzhou, Hubei. In the third year of the Southern Song Dynasty (1207), Minister Liu Jia was built in Shanghai. In the fifth year of Chunyou (1245), Meng Gong Zhijiangling House, the Neiguan Pass was revised 1 1, making it a Waiguan Pass 10. Zhang Ju and Zhangshui flow eastward around the north of the city into the Hanshui River, and the three seas merge into one, and then compete with each other into eight rooms to store and discharge water for 300 miles, which is a natural barrier in Jiangling. In ancient times, the north, China and South China Sea of Beijing were collectively called the Three Seas.