1 Cook shelled beans in a pot of salted boiling water until tender, about 10 minutes. Do not overcook or beans will become soft and mushy.  To make the sauce, heat oil in a large saucepan over medium heat. Saute onions and garlic until golden brown.
Shinano River. The Shinano River (ä¿¡æ¿å·, Shinano-gawa) is the longest and largest river in Japan. It flows from Nagano Prefecture to Niigata Prefecture. It is called the Chikuma River (åæ²å·, Chikuma-gawa) in Nagano Prefecture. The river rises from Mount Kobushi on the border of Saitama, Yamanashi and Nagano, and flows northwest to meet the Sai River from Matsumoto.
Confidence votes 62. The longest river that Japan has is the Shinano River, it is 228 miles long The Shinano river, approx 230 miles, is Japan's longest river and flows from Nagano to Nigata. Anthony Condon.