Original: It is 128 k long and has a watershed of 3990 k. With the Mogami River and the Kuma River, it is regarded as one of the three most rapid flows of Japan.
Simplified: It is 128 km long and has a drainage area of 3990 kmÂ. With the Mogami River and the Kuma River, it is regarded as one of the three most rapid flows of Japan.