description Shinano Overview
The Shinano River is a 367-km river on the island of Honshu in Japan. It is called the Chikuma River in Nagano Prefecture, where its upper course runs through the mountain and basin landscapes of central Japan; after entering Niigata Prefecture, it is known as the Shinano. The river flows northward across the Echigo Plain and reaches the Sea of Japan at Niigata. Its basin supports agriculture, settlements, and extensive flood-control works.
help Shinano FAQ
How long is the Shinano River?
The Shinano is Japan’s longest river at about 367 kilometers. It flows through Nagano and Niigata prefectures before reaching the Sea of Japan.
Why is the river called Chikuma in Nagano?
The upper course is commonly called the Chikuma River in Nagano Prefecture, while the name Shinano is used downstream in Niigata. The two names refer to the same continuous river system.
Where does the Shinano River reach the sea?
The river flows north through Niigata Prefecture and empties into the Sea of Japan near Niigata City. Its lower basin supports extensive rice agriculture and urban settlements.
What makes the Shinano important to Japan?
It is the country’s longest river and supplies water for agriculture, communities, industry, and hydropower. Its wide floodplain also requires levees, channels, and other flood-control infrastructure, especially during heavy rainfall and typhoons.
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