Beijing's Houhai is not a sea, but a lake. The extended meaning can be understood as: don't be confused by common sense and superficial firmness.

In ancient times, the southeast of Beijing was the impact plain of Yongding River and Chaobai River, which was once covered with many beautiful natural lakes. In the Yuan Dynasty, Mongols entered the Central Plains and made Beijing their capital, which was called "Dadu".

Due to the lack of water in Mongolian grassland, it is very rare for Mongolians to have ponds and lakes rich in aquatic plants, so they are called "Haizi", which means "garden". The abbreviation of Mongolian Haizi is Hai. Since then, the name of the sea has been given to Beijing, and gradually derived the names of the sea such as Beihai Park and Zhongnanhai, which have been used to this day.

There is a park near Yizhuang, Daxing, Beijing, called Nanhaizi Park. There is a lake in the park.

Extended data

Other lakes are called seas, but they are not seas.

1, Shichahai

Shichahai is a historical and cultural tourist attraction and historical and cultural protection area in Beijing. Located in Xicheng District, downtown, adjacent to the central axis of Beijing. The water area is 336,000 square meters, which is connected with the waters of Zhongnanhai, and it is the only open scenic spot in the inner city of Beijing.

2. Erhai Lake, once known as Ye Yuze, Kunmichuan, Xi 'er River and Xi 'er River in ancient literature, is located in the suburb of Dali, Yunnan Province, and is the second largest freshwater lake in Yunnan Province. Erhai Lake starts from Eryuan in the north, with a length of about 42.58 kilometers, the widest from east to west of 9.0 kilometers, a lake area of 256.5 square kilometers, an average lake depth of 10 meters and a maximum lake depth of 20 meters.

Chenghai is located at the junction of Qinghai-Tibet Plateau and Yunnan-Guizhou Plateau, belonging to Jinsha River system. There are 47 major rivers and gullies entering the lake, but the flow is very short, and most rivers are seasonal streams.

4. Milk Sea, Milk Sea Scenic Area, located in Aden Nature Reserve, Sichuan Province, also known as Erongcuo: an ancient glacial lake with an area of 0.5 hectares and surrounded by snow-capped mountains. The lake is clear and blue, with a waterfall on the mountain, which is famous for its exquisite, beautiful and elegant water color. There is a large glacier above Erongcuo. Legend has it that it is a holy lake that can cure deaf and dumb strange diseases.

5. Wuliangsuhai is located in Wulateqian Banner, Bayannaoer City, Inner Mongolia, on the edge of the triangle of Hohhot, Baotou and Ordos, and it is 13km away from Wulashan Town, where Wuqian Banner government is located, and10.22km away from the national highway. It is a river lake formed by the diversion of the Yellow River and one of the eight freshwater lakes in China, with a total area of 300 kilometers.