Qinghai Lake

Qinghai Lake is a very big lake in China.

It sits in a high, hollow place. The water is salty. This happens because the sun dries the water away.

Many rivers flow into the lake. Some rivers flow only in certain seasons.

Many birds stop here to rest. They use the lake when they fly across Asia.

In the winter, the lake stays frozen for months. It is a very special place to see.

Qinghai Lake is the largest lake in China.

It sits in a high, hollow area on the Tibetan Plateau. The lake is in the Qinghai Province.

The water is salty and alkaline. This happens because the sun dries the water away. This leaves the salt behind. Many rivers flow into the lake. Most of these rivers only flow in certain seasons.

Many birds stop at the lake during their long flights. They use it as a place to rest while moving across Asia. There are also islands in the lake. Two of these are called the Bird Islands. They are safe places for nature.

The weather can be very cold. In the winter, the lake stays frozen for three months. In the summer, the afternoons are pleasant. But the mornings are often cold. Some people walk or ride horses around the lake. It is a very big trip. It can take many days to finish the circle.

Qinghai Lake is the largest lake in China.

It sits in a high hollow on the Tibetan Plateau. This area is in the Qinghai Province of Northwest China. The lake is located between two special areas called prefectures.

The name Qinghai can mean "Blue Sea" or "Green Sea." This is because the old Chinese name used one word for both colors. In the past, some people even called it the "Western Sea." This was to balance the East China Sea.

The lake is an alkaline salt lake. This means the water is salty and has a high pH of 9.3. The salt level is about 1.4% by weight. This happens because water flows in but then evaporates into the air.

Twenty-three rivers and streams flow into the lake. Most of these streams only flow during certain seasons. Only five permanent streams provide most of the water. The lake's size changes quite a lot over time. It shrank for much of the 1900s but has grown since 2004.

History shows many different people have lived near the water. During the Han dynasty, many people lived in the valley to the east. In the 1600s, Mongol tribes moved to the area. They became known as the Qinghai Mongols. Later, the Qing dynasty took direct control of the region. In the 1900s, different groups like the Hui lived there too. Some leaders even held special ceremonies to worship the God of the Lake.

There are many interesting facts about the lake's size and nature. In 2008, the lake had a maximum depth of 32 meters.

The water is home to five types of native fish. One common fish is called the naked carp. The lake is also a very important spot for birds. Many birds use the lake as a stop on their long flights across Asia. Two islands, known as the Bird Islands, are safe places for these animals.

People still visit the lake for many reasons today. Tibetan Buddhists often walk or ride horses around the entire lake. This trip can take about 18 days on horseback. Some people say it takes 23 days if you walk. There is also a famous island with a Buddhist monastery. In the winter, the lake stays frozen for three months. This makes it a very different place to visit depending on the season.

Qinghai Lake is the largest lake in China.

It sits within an endorheic basin in the Qinghai Province of Northwest China. An endorheic basin is a closed drainage system. This means water flows into the basin but does not flow out to an ocean. The lake is classified as an alkaline salt lake. This means the water is salty and has a high pH level. In 2008, the lake had an average depth of 30 meters. Its maximum depth reached 32 meters.

The lake's chemistry is driven by water movement and evaporation. Twenty-three rivers and streams empty into the lake. Most of these are seasonal streams. Only five permanent streams provide 80% of the total water influx. Because inflow is relatively low, evaporation rates are high. This process has increased the salinity and basicity of the water since the early Holocene. The salt concentration is currently about 1.4% by weight. This is less than the 3.5% concentration found in seawater. The lake has a pH of 9.3.

The lake has undergone many physical stages over thousands of years. It became isolated from the Yellow River about 150,000 years ago. If the water level rose by 180 meters, the connection would return. About 18,000 years ago, the lake was 30 meters lower than it is today. Between 15,600 and 10,700 years ago, levels increased to 10 meters below present levels. Levels peaked about 5,900 years ago at a few meters higher than today. Later, a cooling and drying trend caused the levels to decline.

History shows the lake has been a meeting place for many cultures. During the Han dynasty, many people lived in the Xining valley to the east. In the 17th century, Oirat and Khalkha Mongol tribes migrated there. They became known as the Qinghai Mongols. In 1724, the Qing dynasty took direct rule after a rebellion. During the Nationalist period, the Hui people held power in the government. They even conducted a Kokonuur Lake Ceremony to worship the God of the Lake. This ritual involved both Han and Muslim participants.

Modern history has brought ecological changes to the region. After the 1949 revolution, refugees settled west of the lake. In the 1980s, migration increased due to new business opportunities. This caused ecological stress and a decline in fresh grass production. By 2003, 85% of the river mouths had dried up. This included the Buha River, the largest tributary. The lake's surface area decreased by 11.7% between 1908 and 2000. Shrinkage caused the lake to split into several smaller bodies. These include Gahai Lake, Shadao Lake, and Haiyan Lake.

The lake is a vital location for diverse wildlife. It sits at the crossroads of several bird migration routes in Asia. Many species use the lake as an intermediate stop. Because of this, the lake is a focal point for monitoring avian influenza (H5N1). The Bird Islands serve as a sanctuary within the Natural Protection Zone.

There are five native fish species in the water. The most abundant is the edible naked carp. Other species include four types of stoneloaches. Other fish species disappeared as salinity and basicity increased.

Cultural traditions remain very important to the people near the lake. There is an island in the western part of the lake. It contains a temple and hermitages called "Mahādeva, the Heart of the Lake." Historically, this was home to a Buddhist monastery. In the summer, no boats were used to reach the island. Monks and pilgrims traveled there only when the lake froze in winter. Tibetan Buddhists often circumambulate the lake. This means they walk or ride around its edge. This trip can take 18 days on horseback or 23 days on foot.