For the blue planet Earth, the ocean is much larger than the land, and for many people, two characteristics come to mind when the sea is mentioned, one is salty and the other is deep.
But this does not mean that the sea must be saltier than the lake, nor does it mean that the sea must be deeper than the lake. In the world, there are many saltwater lakes with much higher salt content than seawater, the most well-known of which is the "Dead Sea", although the Dead Sea is called "Sea", it is actually a lake, which is a saltwater lake with a high salt content, and even many people mistakenly think that the Dead Sea is the saltwater lake with the highest salt content in the world, which is actually wrong.
The salt content of the Dead Sea is about 30%, while the average salt content of seawater is 3.5%, which shows that the Dead Sea is much saltier than seawater. On weekdays, if we accidentally choke on a mouthful of seawater, we will be grinning from salty teeth, if we drink a mouthful of water from the Dead Sea, the result can be imagined. However, although the salt content of the Dead Sea is high, it can only rank third, and there are two lakes in the world, which are even saltier than it.
In second place is Lake Asal in Africa, with a salt content of 34.8%, while the first-ranked saltwater lake in the Antarctic, which has a salt content of more than 40%, is called "Don Juan Pond".
Antarctica is a cold place where it is almost impossible to see lakes in the form of liquid water, and don Juan Pond is one, because of its extremely high salt content, it almost does not freeze all year round, the scene is very beautiful.
It is a very common phenomenon that the salinity of seawater is not as good as that of saltwater lakes, but if the depth of the sea may not be as deep as that of lakes, it may be contrary to common sense, but this is the truth. Not all seas are bottomless, and some are shallow, such as the Bohai Sea. The Bohai Sea is China's coastal water, although it is a sea, but because it is surrounded by land on three sides, it also belongs to the category of internal water. The area of the Bohai Sea is not large, with a total area of only about 80,000 square kilometers.
However, the Bohai Sea is not so small from the beginning, it is gradually becoming smaller.
Friends who have been to Cangzhou City, Hebei Province, should know that in the southeast suburbs of Cangzhou City, about 16 kilometers away from the city, there is a statue of the god of zhenhai, that is, the famous "Cangzhou Iron Lion", and the Famous Huaiyang dish "Iron Lion Head" is a combination of "Lion Head" and "Cangzhou Iron Lion". The Iron Lion of Cangzhou is a statue of the god of the zhenhai, and cangzhou is a place that has nothing to do with the sea, what does it mean to build the statue of the god of the town of the sea here?
The Cangzhou Iron Lion was founded in 953 AD, that is, the third year of the Later Zhou Guangshun, and at that time, Cangzhou was indeed on the Bohai Sea, which means that this statue was not built in the wrong place. Now more than 1,000 years have passed since the construction of the Cangzhou Iron Lion, and the distance between the Cangzhou Iron Lion and the coast has reached more than 70 kilometers, that is to say, in 1,000 years, the coastline of the Bohai Sea has moved more than 70 kilometers eastward, which has greatly reduced the area of the Bohai Sea.
What has led to the shrinking of the bohai sea area? It's sediment.
In the world, most of the coastal areas have large or small natural harbors, while in the western part of the Bohai Sea, slightly larger natural harbors are almost non-existent, because the coastal area of the Bohai Sea is basically silt, and this sediment is brought by the rivers flowing into the Bohai Sea.
The Bohai Sea is located in the lower part of the North China Plain, so there are many rivers flowing in, such as the Yellow River, the Haihe River, the Liao River and the Luan River that we are familiar with, these rivers are wrapped in sediment flowing into the Bohai Sea, making the area of the Bohai Sea smaller and smaller, and the most important of which is the Yellow River, according to a statistic at the end of the last century, the Yellow River brings more than 1.6 billion tons of sediment to the Bohai Sea every year, according to the past trend, if this situation continues, hundreds of years later, the Bohai Sea may even disappear completely. The current Bohai Sea is less than 80,000 square kilometers, and it is not only small, but also shallow.
As a sea, the average depth of the Bohai Sea is only 18 meters, what is this concept? The average water depth of Qinghai Lake, a famous inland lake in China, is 21 meters, which means that the depth of the Bohai Sea is not as deep as Qinghai Lake.
18 meters is the average depth of the Bohai Sea, so is there a deeper place in the Bohai Sea? The deepest part of the Bohai Sea is the Old Tieshan Waterway in the Bohai Strait, where the water depth reaches 86 meters. Doesn't that sound OK? In fact, it is still not very deep, because the Yellow Sea adjacent to the Bohai Sea has an average depth of 90 meters, which means that the deepest part of the Bohai Sea does not have the average depth of the Yellow Sea. The Bohai Sea is small and shallow, but this is only relative, if we are standing on the shore of the Bohai Sea, we will feel the vastness of the sea, and we will feel the depth of the sea and feel afraid, especially at night, looking at the looming waves in the distance, we will feel that there are too many secrets hidden in the sea, so many people dare not get close to the sea at night.