Nagano Noodle is a type of Japanese noodle dish made from buckwheat flour. The term 'Nagano Noodle' is derived from the city of Nagano, which is located in the central region of Japan. The dish is also known as 'soba, ' which is a four-letter word that is commonly used to describe the dish. It is usually served cold with a dipping sauce and garnished with green onions, wasabi, and other ingredients.