Lake Biwa

Lake Biwa is a big lake in Japan.

It sits in a place called Shiga. This lake is very, very old. It is one of the oldest in the world.

The lake looks like a musical tool. It looks like a biwa. This is a stringed instrument. People use this name for the lake.

Many animals live in the water. There are many kinds of fish. A giant catfish lives there too.

It is a very large fish.

Many birds visit the lake each year. The lake also gives water to people. It helps many people have clean water to drink.

It is a very special place to see.

Lake Biwa is a large lake in Japan.

It sits in the Shiga area. The lake is very old. It is over 4 million years old. This makes it the 13th oldest lake in the world.

The lake has a special shape. It looks like a biwa. A biwa is a stringed instrument. Many people believe the name comes from this shape.

Many living things call the lake home. There are over 1,000 kinds of animals and plants there. About 5,000 waterbirds visit each year. Many fish live in the water too. One fish is the giant Lake Biwa catfish.

It is a large fish that lives only in this lake.

Lake Biwa is very useful for people. It gives drinking water to 15 million people. It also helps nearby cities and factories. The lake has many beautiful beaches. People can visit museums or see the reed plants on the shore. These reeds help keep the water clean. The lake is a very important part of Japan.

Lake Biwa is a huge freshwater lake in Japan.

It sits entirely inside the Shiga Prefecture. This area is in the west-central part of Honshu island. The lake is located northeast of Kyoto, which was once the capital city. It is a very ancient place. Scientists think the lake is over 4 million years old. This makes it the 13th oldest lake on our planet. Because it is so close to Kyoto, many old poems and stories mention it.

The name of the lake tells a story about its shape. People call it Biwa-ko. This name was used during the Edo period. Many believe the lake looks like a biwa. A biwa is a traditional stringed instrument. A monk named Kōsō wrote about this in the 14th century. He said the goddess Benzaiten lives on Chikubu Island. He believed the lake was shaped like her favorite instrument. The lake was also called Omi in the past.

Water flows in and out of the lake in a special way. Small rivers from nearby mountains flow into the water. The main way water leaves is through the Seta River. This river eventually joins others to become the Yodo River. The Yodo River flows into Osaka Bay. Lake Biwa is very important for people living nearby. It provides drinking water for about 15 million people. It also helps local textile factories and cities like Kyoto and Otsu.

Many unique living things call this lake home. There are more than 1,000 different species of animals and plants there. About 5,000 waterbirds visit the lake every year. Many fish are found here that do not live anywhere else.

One famous fish is the giant Lake Biwa catfish. It is the largest predator in the lake. There are also many types of snails and clams. Some fish, like the Biwa trout, are also unique to this water. However, foreign fish like black bass have caused some trouble for the local species.

People have lived near Lake Biwa for a very long time. Archaeologists found the Awazu site near the southern end. This site is a shell midden from the Jomon period. It dates back to around 9300 BCE. People there used plants and animals for food. They even learned how to eat horse chestnuts safely. Today, people visit the lake for fun and learning. They can go to the Lake Biwa Museum or visit beautiful beaches. The lake remains a vital part of Japan's nature and history.

Lake Biwa is the largest freshwater lake in Japan.

It is located entirely within the Shiga Prefecture on the island of Honshu. This region sits in west-central Japan, northeast of the former capital city of Kyoto. The lake is a tectonic lake, meaning it was formed by movements in the Earth's crust. Scientists estimate that it is over 4 million years old. This makes it the 13th oldest lake in the entire world. Because it is so close to Kyoto, the lake appears often in Japanese literature and historical poetry.

The name Biwa-ko was established during the Edo period. Many people believe the lake is named for its shape. It resembles a biwa, which is a traditional Japanese stringed instrument. A 14th-century monk named Kōsō provided a famous explanation for this name. He wrote that the lake is the Pure Land of the goddess Benzaiten. He believed she lives on Chikubu Island. He also noted that the lake's shape looks like the biwa, which is her favorite instrument. In the past, the lake was also known as Ōmi.

Water moves through the lake via a specific system of rivers. Small rivers from the surrounding mountains drain into the lake. The Seta River serves as the main outlet for the water. The Seta eventually becomes the Uji River. This river joins the Katsura and Kizu rivers to form the Yodo River. The Yodo River eventually flows into Osaka Bay at the Seto Inland Sea. This water system is a vital resource for the Kansai region. It provides drinking water for approximately 15 million people. It also supports cities like Kyoto and Ōtsu, and helps local textile industries.

The lake is a massive center of biological diversity. Because it has existed for millions of years without interruption, many unique species have evolved there. Naturalists have documented more than 1,000 species and subspecies in the lake. About sixty of these are endemic, meaning they are found nowhere else on Earth. This includes 46 native fish species and subspecies.

One notable predator is the giant Lake Biwa catfish. The lake is also a major breeding ground for trout and for the pearl culture industry. Additionally, about 5,000 waterbirds visit the lake every year.

Some of the endemic fish species are very specific to these waters. These include five types of cyprinids and two types of gobies. There are also two types of silurid catfish and a cottid. The Biwa trout is another famous endemic species, though some scientists classify it as a subspecies of the masu trout. The lake also supports many molluscs. There are 38 species of freshwater snails and 16 types of bivalves. Nineteen of the snails and nine of the bivalves are endemic to the lake.

However, the ecosystem faces challenges from invasive species. Foreign fish like black bass and bluegill have impacted the local biodiversity. Black bass were first introduced in 1925 to be used as game fish. One largemouth bass caught in 2009 weighed 10.12 kg. This catch tied the world record held by George Perry for 77 years. Bluegills were also introduced after being presented as gifts to Prince Akihito in 1966. These non-native species compete with the ancient, native residents of the lake.

Humans have interacted with Lake Biwa for thousands of years. Archaeologists have discovered the Awazu site near the southern end of the lake. This is a submerged shell midden from the Jōmon period. It dates back to approximately 9300 BCE. The site shows how Jōmon people used local plants and animals for food. At the Awazu Midden 3 site, researchers found many horse chestnuts. These findings suggest that people had mastered ways to remove harmful tannic acid from the nuts. This made them safe to eat.

Today, there are many laws to protect the lake's environment. In 1979, the Eutrophication Control Ordinance was enacted to stop industrial pollution. This followed a successful public campaign called the Soap Movement. This law sets standards for nitrogen and phosphorus in the water. Additionally, the lake is a designated UNESCO Ramsar Wetland. This protects its valuable wetland areas. There is also a specific ordinance to protect reed vegetation zones. These reeds are important because they purify the water and provide habitats for birds and fish.