Osaka is a large port city and commercial center on the Japanese island of Honshu. It's known for its modern architecture, nightlife and hearty street food. The 16th-century shogunate Osaka Castle, which has undergone several restorations, is its main historical landmark. It's surrounded by a moat and park with plum, peach and cherry-blossom trees. Sumiyoshi-taisha is among Japan’s oldest Shinto shrines. Osaka is known as the 'Manchester of Japan' as it is an important textile center in Japan. Several geographical factors played a key role in the development of the textile industry in Osaka. Those factors are given below: There was an abundant supply of water for the cotton mills due to River Yodo.