Тюбу
is the capital and the most populous city of Niigata Prefecture located in the Chūbu region of Japan. It is the largest city on the west coast of Honshu, and the second largest city in Chūbu region after Nagoya. It faces the Sea of Japan and Sado Island. , the city had an estimated population of 797,591, and a population density of 1,098 persons per km2. The total area is . Greater Niigata, the Niigata Metropolitan Employment Area, has a GDP of US$43.3 billion as of 2010.